Season 4

Complete listed story — includes the ending

1. Inhospitable

One year after the events of Outsiders, M'gann, Conner, Garfield and J'onn J'onzz travel to Mars so M'gann and Conner can have a Martian wedding ceremony. Upon arrival, they find out the Red Martian king has been murdered, with the Green Martians and White Martians blaming each other. Despite many Martians not trusting Earthlings, the Martian Queen orders the construction of a Zeta Beam tube that will connect them with Earth. Just as M'gann's younger brother M'comm is captured, J'onn tests the Zeta tube when it explodes. In a mid-credits scene, Violet Harper talks with Black Canary about her feelings for Brion and her relationship with the Muslim faith. Note: This episode is dedicated to the memory of W. Morgan Sheppard, the voice of Sardath, who died on January 6, 2019.

2. Needful

J'onn confirms he made it to the Watchtower unharmed when the Mars communication satellite explodes. M'gann interrogates M'comm about the explosion which M'comm refuses to tell until he rebukes her for abandoning him. Conner and M'gann spend the day with M'gann's family and S'yrra, a Yellow Martian priestess. The three Legion heroes secretly following them are Saturn Girl, Phantom Girl, and Chameleon Boy. They look for their enemy, the actual man behind the recent attacks. DeSaad of Apokolips meets with M'comm and gives him a virus bomb capable of killing every non-White Martian on Mars. In a mid-credits scene, Garfield listens to a voicemail from Perdita.

3. Volatile

M'gann's Bio-Ship has decided to retire on Mars and has an offspring named Baby to take care of the Team. Meanwhile, Garfield is haunted by visions of Brion, the Outsiders, and all the people he is afraid of losing. Someone who appears to be M'gann saves Garfield's mind (caused by the green Martians' psychic blast) and encourages him to seek help for his trauma before he is rescued. She is actually Saturn Girl, and her intervention was not part of the Legion's mission. In a mid-credits scene, Superman helps Lois Lane with their son Jon.

4. Involuntary

As Prince J'emm 's birthday celebration approaches, M'comm plants the virus bomb underneath the event arena. Meanwhile, M'gann, Conner, and Garfield find out S'yrra is the King's murderer. S'yrra confesses to J'emm that she accidentally killed him after he forbade her to marry J'emm because of the color of her skin, and her emotional outburst caused her to lose control of her powers: her arrest saddens J'emm, who swears to help Mars forbid its caste system. The bomb is discovered due to the Legion's enemy secretly adding kryptonite to it. Conner submerges it in lava, saving everyone, but the kryptonite seemingly kills him. In a mid-credits scene, M'gann weeps at the ceremonial altar where their wedding was set to take place.

5. Tale of Two Sisters

Artemis lives a happy, balanced life as a hero and civilian, until she hears of Conner's death and a woman named Onyx Adams appears. Onyx claims she defected from the League of Shadows to warn them Cassandra Savage is going to come to her and lie about switching sides. Cassandra, now missing half an arm and blind in one eye, arrives and says Onyx is the one lying. Artemis does not know whom to believe and decides to ask for help from her sister, Jade / Cheshire. In a mid-credits scene, Dick and Kaldur stand at Conner's memorial hologram while in narration, Artemis quotes A Tale of Two Cities. [ citation needed ]

6. Artemis Through the Looking-Glass

Jade agrees to help after learning that the Shadows know where Lian Harper lives. She starts interrogating Cassandra and Onyx, when the Shadows appear and capture Orphan. Lady Shiva threatens to kill her if Artemis does not turn over Cassandra. Orphan is actually Lady Shiva's daughter, and she used to be part of the Shadows before Batman took her in. Artemis, Onyx, and Cassandra agree to team up to rescue her, and Jade leaves. Meanwhile, a distraught Garfield returns to Earth, where he learns of Brion welcoming all metahumans to Markovia. In a mid-credits scene, a genomorph mourns Conner, while Artemis narrates quotes from Through the Looking-Glass. [ citation needed ]

7. The Lady, or the Tigress?

On Mars, M'gann confronts M'Comm for the gene bomb that killed Superboy and learns he is innocent before he flees to Apokolips, leaving her in deep and further despair over Conner's death. Back on Earth, a voice-over from Artemis narrates The Lady or the Tiger? as she, Cassandra Savage, and Onyx head to Santa Prisca. In flashbacks, Orphan goes on her first mission to kill the Joker. She almost does it, but Batgirl stops her and is paralyzed after Cassandra injures her spine. In the present, the team arrives in Santa Prisca, where Cassandra is revealed as the mole and her missing arm is based on a magical illusion. Cheshire turns up to help Artemis and Onyx and they find Orphan but are cornered by Lady Shiva and her fellow Shadows. Meanwhile, Em'ree decides to join M'gann and J'onn on their journey back to Earth. In a mid-credits scene as the three rides in silence, Artemis finishes her narration. [ citation needed ]

8. I Know Why the Caged Cat Sings

It is revealed that Onyx was tricked into defecting to cause confusion among the team. After an escape attempt, Shade switches sides and helps the heroes escape, to repay an old debt to Cheshire, and announces his resignation to the League of Shadows. An enraged Shiva threatens Cassandra, causing them to fight. Cassandra gains the upper hand, but spares Shiva after remembering Barbara's injuries. Jade agrees to return to her family, but flees in panic at the last moment, feeling she is too much like her abusive father, Sportsmaster. The heroes travel to Infinity Island, where Sensei and Ra's al Ghul offer Jade and Onyx a chance at rehabilitation. At the Kent farm, Clark deals with his guilt over Conner's death. In a mid-credits scene, Artemis quotes I Know Why the Caged Bird Sings over photos of herself and Wally, and herself and Jade as children. [ citation needed ]

9. Odnu!

Millennia ago, a village of metahumans founded by Vandal is slaughtered by Klarion. He is one of the Lords of Chaos, cosmic beings in constant conflict with their counterparts, the Lords of Order. After many fights, Vandal and Klarion call a truce. Another Lord of Chaos, Child, arrives on Earth in the present. She creates a diamond golem named Flaw as her anchor, attracting the attention of Zatanna and her students ( Mary, Khalid, and Tracy ). When they arrive, they encounter Klarion, who had also sensed Child arriving. They fight, and Klarion defeats them, but is summoned by Child before he can kill them. The Phantom Stranger, who is narrating the story, warns Vandal Savage about the upcoming threat, as a reminder of his pact with Klarion. Meanwhile, Blue Devil unsuccessfully tries to talk Garfield out of his depression. In a mid-credits scene, Saturn Girl and Chameleon Boy watch an episode of Garfield's sci-fi show Space Trek 2036.

10. Nomed Esir!

Vandal and his grandson Arion rebuild Atlantis. The Lords of Order recruit Arion, giving him the power to create humans with magic, Homo Magi. Vandal has Klarion sink Atlantis so it may conquer beneath the oceans; killing Arion and creating Homo mrmanus (modern Atlanteans) in the process. In the present, Child reveals the Lords of Chaos sent her to replace Klarion and is backed by their combined power. The Phantom Stranger teleports Zatanna to witness the fight between Klarion and Child, while taking her students to recruit Etrigan the Demon for support. Despite Etrigan joining the fight, Child overwhelms all participants, forcing Klarion to retreat. Zatanna decides to ask for assistance to defeat Child. Meanwhile, Em'ree helps M'gann with her grief, and Vandal talks to his son Nabu /Doctor Fate, warning him of Child. In a mid-credits scene, Vandal prepares to have the Light and everything of value to him evacuated to Warworld.

11. Teg Ydaer!

In Ancient Babylon, Vandal and Klarion summon Starro, which kills Vandal's son Nabu. The Lords of Order make Nabu's spirit one of them, anchoring him to the helmet. In the present, Zatanna goes to Nabu for help, but he chooses not to interfere. He also claims Zatanna's students are unprepared for battle. Nabu tests each of the students with their own insecurities, though all three pass their tests. Zatara points out Nabu working with his host's bodies and other heroes proves that Order does not have to stand apart. Klarion comes to Doctor Fate for help but is followed by Child. In the ensuing battle, Flaw kills Klarion's anchor cat Teekl, untethering him. Meanwhile, Garfield becomes addicted to sleeping pills. In a mid-credits scene, a school bus driver and children scream as they fall through different dimensions.

12. Og Htrof Dna Reuqnoc!

Child destroys the Tower of Fate, cracking Fate's helmet, and proceeds to cause various disasters across the planet. While heroes and villains team up to contain the damage, Dr. Fate, Zatanna, and her protégés follow and confront Child at the North Pole. She easily defeats them, and Klarion, having traveled through time by anchoring himself to the school bus seen in the previous episode, finds them shortly after. In flashbacks, Zatara talks about his beginnings as a hero, his duty as Doctor Fate, and his relationship with his daughter, his deceased wife, and his mentor, Kent Nelson. He makes Nabu promise to tell Zatanna his story should his body die. Meanwhile, Garfield is replaced on Space Trek 3016 because of his poor performance. In a mid-credits scene, Superman talks to Black Lightning about setting up reserve heroes for the Justice League.

13. Kaerb Ym Traeh!

After finding Klarion a new anchor cat, he and the heroes confront Child again. Vandal and the Phantom Stranger convince the Lords of Order and Chaos that Earth is needed to stop Darkseid. The Lords remove Child's power and Traci destroys Flaw, causing Child to untether. Zatanna proposes she, her father, Traci, and Khalid rotate weekly as Fate's host. Mary gets excluded, as she is deemed too much like Nabu, and quits the team. Khalid suspects Zatanna took on students to get her father back, but as the rest agree to her plan, he joins in. Sending the school bus back to its place in time, Zatanna sees Conner pleading for help. Meanwhile, Garfield breaks up with Perdita after she discovers his sleeping pill addiction and depression. In a mid-credits scene, Zatara begins therapy with Dinah affected by his time as Nabu's host. In a post-credits scene, Granny Goodness ' voice provokes a distraught Mary into saying "Shazam".

14. Nautical Twilight

Dick tries to persuade Kaldur to take a break to deal with his grief over Conner's death, but he refuses and heads to Poseidonis for an important Atlantean conference. Violet pays a visit to Gabrielle's mother to learn about Gabrielle's faith, Islam. Meanwhile, Conner and an unconscious Phantom Girl turn out to be alive in a disembodied state in an unknown dimension. Ocean Master attacks the conference but is stopped by an unknown man. In a mid-credits scene, Violet talks to Harper Row about religion and, having come to identify as non-binary, asks to be identified by the pronouns they/them.

15. Ebb Tide

With M'gaan's retired bio-ship as an aid for their travel, Saturn Girl and Chameleon Boy reveal to Superman that they are heroes from the future and ask for him to be in Happy Harbor in ten years from the present day. They later go to Bart Allen for help. Meanwhile, King Arthur begins repair works in Poseidonis and Mera believes the stranger might be the Atlantean king of an ancient prophecy. Child causes a pillar of fire in Atlantis, and Mera, Ocean Master, and the unknown man defeat it together. Orm is later arrested and the stranger reveals himself to be Arion. While exploring the dimension, Conner grows frustrated until the Devourer, a Dunkleosteus -like creature, attacks him while he is protecting Phantom Girl. Conner discovers the Devourer is attracted by his anger and calms himself, allowing it to pass through him harmlessly. In a mid-credits scene, Vandal declares Project Thrinos to be their priority.

16. Emergency Dive

M'gann returns to Happy Harbor and learns about Garfield's depressive state. She recruits teammates and friends to convince him to seek help, but Garfield rejects them, claiming he does not need help. However, M'gann informs Garfield that he has to attend a mandatory mental health check with Black Canary, or he will be dismissed from the team. In Poseidonis, Arion gains popularity among the citizens. King Arthur sends Kaldur on a mission to find the Crown of Arion, which was lost in the ruins of Atlantis when it was sunk. While Kaldur, Wyynde, La'gaan, and Delphis sneak into Xebel during the unrest, King Arthur visits Ocean Master and realizes he is a clone. As Conner carries Phantom Girl, he starts to hallucinate about his life and spots the school bus, which Klarion has made his vessel. He pleads for help, but is unheard. In a mid-credits scene, Forager delivers the valedictorian speech during his and Halo's graduation.

17. Leviathan Wakes

After weeks of searching, Kaldur's party finds Arion's crown and returns it to Poseidonis. M'gann discovered from her telepathy that both Orm and Arion are clone created by Vandal Savage for his plan to taking control Atlantis. Using Orm as a distraction, Arion is loyal to the Light and followed Savage's instruction. As Arion puts the Crown on, the Lords of Order disintegrate him, deeming him unworthy and removing the Crown's magic. Arthur refuses to be the High King again, and Mera becomes regent, fulfilling the prophecy. Arthur decides to focus on being a father and returns to the League. La'gaan agrees to be Aquaman too and Kaldur decides to take a leave of absence from the League. Meanwhile, Doctor Fate goads Savage for his failure in taking over Atlantis. In a mid-credits scene, Kaldur seeks counseling with Black Canary, confronting his grief.

18. Beyond the Grip of the Gods!

Rocket has trouble bringing her autistic son, Amistad, to his father's house and goes on a League mission with Jay Garrick and Forager to New Genesis for a summit with the New Gods and Green Lantern Corps. Meanwhile, a bug steals a device from the New Gods' warehouse and escapes. On Apokolips, Ma'alefa'ak works for Darkseid, who is unimpressed at the moment, and Grayven instructs him to follow Lor-Zod 's command. A Martian slips something into the stolen technology, which makes Orion turn berserk. As Raquel contains Orion, Lightray uses the Mother Box to calm him down. Raquel grows distrustful of Orion because of his parentage. Meanwhile, Conner wonders aimlessly and continues hallucinating, until Dru-Zod appears and offers to teach him how to survive in the Phantom Zone. In a mid-credits scene, Black Lightning and Superman discuss candidates for the Justice League Reserve. Note: This episode is dedicated to René Auberjonois, the voice of Blockbuster, who died on December 8, 2019.

19. Encounter Upon the Razor's Edge!

It is revealed that General Zod was sent to the Phantom Zone by the House of El before Krypton's destruction. He is released in the 31st century by the United Planets, but gets re-imprisoned by the Legion after planning an invasion. Lor-Zod, his son, travelled back in time to kill Superboy, who inspired the creation of the Legion of Super-Heroes. Lor now plots to steal a Phantom Zone projector to free his parents and their followers. En route to New Genesis, Green Lanterns Tomar-Re and Kilowog reunite with Blue Lantern Razer, after four years of his quest. On the planet, Razer trades his new ring for his old red one to Metron, who goads him into unleashing its power. After injuring Female Forager by accident, Razer realizes his mistake and decides to use both his rings at once, before leaving to find his displaced love, Aya. Meanwhile, Bart agrees to assist the Legion and installs a cosmic treadmill on M'gann's retired bio-ship. In a mid-credits scene, the team celebrates Jay's 102nd birthday.

20. Forbidden Secrets of Civilizations Past

Lor-Zod, Ma'alefa'ak, and Mantis attempt to steal the Phantom Zone projector from Metron's vault, using the Kaizer Thrall device to enter his hidden dimension. A baby Sun-Eater that guards the vault disrupts their efforts, so they capture Metron and force him to lead them to the Projector. Metron escapes by tricking Lor into opening a kryptonite box. He flees to the summit on New Genesis, while Mantis saves his team and finds the projector. Beast Boy receives counseling from Black Canary, admitting his need for help. Forager reveals he is considering leaving the Team for Female Forager. In the Phantom Zone, Conner joins Dru's group of imprisoned Kryptonians. In a mid-credits scene, Forager recites Romeo's speech from the balcony scene in Romeo and Juliet.

21. Odyssey of Death!

On New Genesis, Lor and his team use the projector to open a portal to the Phantom Zone to retrieve Dru. The process awakens a Promethean, endangering the planet. Rocket's team appears and tries to stop the villains. Tomar-Re is killed by Lor-Zod, but successfully diverts the energy of the Promethean. His ring chooses Female Forager as his successor, allowing her to disable the Kaizer Thrall. Jay contains the portal, while the Legion arrives on bio-ship and destroy the projector and Saturn Girl, sensing Phantom Girl through the portal, wakes her up. Lor-Zod and Ma'alefa'ak storm bio-ship and take all onboard hostage. The New Gods and Green Lantern Corps consent to the treaty, and agree to hunt down Lor-Zod and Ma'alefa'ak. Female Forager decides to train as a Green Lantern on Oa while keeping a long-distance relationship with Forager. In a mid-credits scene, Female Forager recites a monologue from Hamlet, which she received from Forager.

22. Rescue and Search

Zatanna and Dick team up to determine if Conner is still alive. During their investigation, they discover Bart has also gone missing and learn about the existence of Chameleon Boy and Saturn Girl. They confirm Conner is alive and trapped in the Phantom Zone. In Fate's tower, Dick, Zatanna, Artemis, Raquel, and Kaldur summon Klarion to ask him to bring Conner back, but he refuses. Zatanna asks Dick to find the school bus Klarion used as an anchor. In the Zone, Conner explains to Dru and Ursa what he remembers of his origins and the fate of Krypton. He believes he killed Superman. When the Zods leave, Phantom Girl warns Connor they are in danger. In a mid-credits scene, Female Forager and the Green Lanterns study the Kaizer Thrall and discover remnants of an 11-year-old human boy inside it. He tries to communicate with them. Note: This episode is dedicated to the memory of Ed Asner, the voice of Kent Nelson, who died on August 29, 2021.

23. Ego and Superego

In Markovia, Lizard Johnny is rescued by Brion and his Infinitors, who are unaware that Everyman is responsible for inciting anti-metahuman mobs. Johnny is later piled with propaganda. Violet moves into college, where Harper admits to being in love with them. Realizing their unresolved feelings for Brion, Violet goes to Markovia and tries to convince him to change sides. Brion refuses and Violet leaves, deciding to invite Harper out. In the Phantom Zone, Phantom Girl explains to Conner how they got there and attempts to leave with him. Still under the influence of the Zods, Conner refuses and exposes her to Dru and Ursa, forcing her to retreat to Mars. Meanwhile, Zatanna's group finds the school bus, repairs it, and uses it to create a portal to the Zone.

24. Zenith and Abyss

The Team finds Conner in the Phantom Zone but he refuses to join them. M'Gann, the Justice League, and Female Forager make contact with the Kaizer Thrall, learning it contains the brain of Danny Chase, a metahuman boy who was trafficked by the Light to Apokolips and dissected by DeSaad. J'emm J'axx contacts the League, revealing with Phantom Girl that Superboy is alive. Planning to rescue Superboy, they travel to Trombus, a planet under a red sun to ensure the Kryptonians will be powerless, and create a Boom Tube to the Zone. However, Ma'alefa'ak and Lor arrive, take control of the Kaizer Thrall and subdue the group. Dru, Ursa, Faora, and Conner leave the Phantom Zone. Lor greets his parents and declares victory. In a mid-credits scene, Teekl sleeps on Warworld's vacant control chair.

25. Over and Out

The Team holds off Zod's army from escaping the Phantom Zone through the Kaizer Thrall's Boom Tube. Nightwing volunteers to go through it, winds up in the Fortress of Solitude, and seemingly dies fighting Lor. Zatanna secures the Team's safety by opening a portal which closes before Rocket can follow. M'gann's group and the Legion go after the Zods. Sensing their arrival, Ursa, newly turned into the Emerald Empress, blasts the bio-ship. Superman survives the crash, but is poisoned with kryptonite and taken hostage. The Zods go to Metropolis, where Dru claims rulership over Earth and orders Connor to execute Superman.

26. Death and Rebirth

It is revealed that Dick and M'gann's group faked their deaths. They head to Metropolis and reunite with Kaldur, Zatanna, and Artemis. The heroes fight Zod's team while M'gann restores Conner's memories. He, Superman, Danny, and an alive Rocket join the fight and win. Zod and his followers are sent back to the Phantom Zone. Lor escapes in the repaired Time Sphere that brought Rocket back courtesy of Metron, but this results in Lor's death due to Metron's hijacking. Pregnant with the unborn Lor, Ursa is taken to planet Daxam by the Emerald Eye of Ekron. A few days later, Conner and M'gann finally get married in the presence of their friends and family, while Brainiac 5 takes the Legionnaires back to the future. The Light captures the Kryptonians in the Zone and holds them captive on Warworld, while Darkseid and Grayven offer Ma'alefa'ak a new planet for the White Martians. In a post-credits scene, Darkseid meets his two newest Furies: Black Mary and a Kryptonian they received from the Light, Kara Zor-El.