Black Panther

Thousands of years ago, five African tribes warred over a meteorite containing the metal vibranium. One warrior ingests a "heart-shaped herb" affected by the metal and gains superhuman abilities, becoming the first "Black Panther". He unites all but the Jabari Tribe to form the nation of Wakanda. Over centuries, the Wakandans use vibranium to develop advanced technologies and isolate themselves from the world by posing as an underdeveloped country. In 1992, Wakandan king T'Chaka visits his brother N'Jobu, who is working undercover in Oakland, California. T'Chaka accuses N'Jobu of assisting black-market arms dealer Ulysses Klaue with stealing vibranium from Wakanda. N'Jobu's partner reveals he is Zuri, another undercover Wakandan, and confirms T'Chaka's suspicions.
In the present day, following T'Chaka's death, his son T'Challa returns to Wakanda to assume the throne. He and Okoye, leader of the Dora Milaje, extract T'Challa's ex-lover Nakia from an undercover assignment so she can attend his coronation ceremony with his mother Ramonda and younger sister Shuri. At the ceremony, the Jabari Tribe's leader M'Baku challenges T'Challa for the crown in ritual combat without the benefit of the heart-shaped herb. T'Challa defeats M'Baku, and persuades him to yield rather than die.
When Klaue and his accomplice Erik Stevens steal a Wakandan artifact from a London museum, T'Challa's friend and Okoye's husband W'Kabi urges him to bring Klaue back alive. T'Challa, Okoye, and Nakia travel to Busan, South Korea, where Klaue plans to sell the artifact to CIA agent Everett K. Ross. A firefight erupts, and Klaue attempts to flee but is caught by T'Challa, who reluctantly releases him to Ross's custody. Klaue tells Ross that Wakanda's international image is a front for a technologically advanced civilization. When Erik attacks to extract Klaue, Ross is gravely injured protecting Nakia. Rather than pursue Klaue, T'Challa takes Ross to Wakanda, where their technology can save him.
While Shuri tends to Ross, T'Challa confronts Zuri about N'Jobu, since Erik wore a necklace that belonged to him. Zuri explains that N'Jobu had become disillusioned with Wakanda's isolationism and planned to share Wakanda's technology with people of African descent to help them overcome their oppressors, with Klaue's assistance. Before T'Chaka could apprehend N'Jobu, N'Jobu attacked Zuri, forcing T'Chaka to kill him. T'Chaka instructed Zuri to claim that N'Jobu had vanished and to leave behind N'Jobu's American son, N'Jadaka, to uphold the story. This boy grew up to become Erik, a U.S. black ops Navy SEAL who took on the nickname "Killmonger". Meanwhile, Killmonger kills Klaue and brings his body to Wakanda. He is presented before the tribal elders, revealing himself as N'Jadaka and asserting his claim to the throne. Killmonger challenges T'Challa to ritual combat, severely injures him, and kills Zuri, while T'Challa is presumed dead after Killmonger throws him over a waterfall. Killmonger ingests the heart-shaped herb and orders the rest to be incinerated, but Nakia manages to extract one. Killmonger, backed by W'Kabi and his army, prepares to distribute shipments of Wakandan weapons to operatives worldwide.
Nakia, Shuri, Ramonda, and Ross flee to the Jabari Tribe for aid. They find a comatose T'Challa, rescued by the Jabari as repayment for sparing M'Baku's life. Healed by Nakia's herb, T'Challa returns to fight Killmonger, who also dons a nanotech suit similar to T'Challa's. W'Kabi and his army fight Shuri, Nakia, and the Dora Milaje, while Ross remotely pilots a jet and shoots down the planes carrying vibranium weapons before they can leave Wakanda. M'Baku and the Jabari arrive to reinforce T'Challa. Confronted by Okoye, W'Kabi and his army stand down. Fighting in Wakanda's vibranium mine, T'Challa disrupts Killmonger's suit and stabs him. Killmonger refuses to be healed, choosing to die as a free man rather than be incarcerated; T'Challa shows him the Wakanda sunset, and Killmonger dies peacefully.
T'Challa establishes an outreach center at the building where N'Jobu died, to be run by Nakia and Shuri. In a mid-credits scene, T'Challa appears before the United Nations to reveal Wakanda's true nature to the world. In a post-credits scene, Shuri helps Bucky Barnes with his rehabilitation.