Dead Rising 3

Dead Rising 3 takes place in 2021, 10 years after the events of the Fortune City outbreak and 15 years after the Willamette outbreak. The story follows a young mechanic named Nick Ramos and his attempt to survive a massive zombie outbreak in the fictional city of Los Perdidos, California. The game begins three days after the initial outbreak. After returning from a failed search for supplies, Nick reunites with some other survivors at a diner including his boss Rhonda, a girl named Annie, a trucker named Dick, a man named Peter and his mother. After the zombies break into the diner and kill Peter and his mother, Annie runs back to her own group of survivors. Nick and the others make it to Rhonda's auto shop and learn that the government is going to bomb the city in six days to stop the outbreak. The group drives to a military checkpoint, only to find everyone there dead and be ambushed by a rogue biker gang.
After defeating the bikers, Nick reunites with his old friend Diego, who is now a soldier, and learns from him that there is a plane at the old museum in town that can be fixed up and used to escape the city before it is destroyed. However, before starting to work on the plane, Nick is bitten by a zombie and heads to the crematorium in town to search for some Zombrex, meeting a man called Gary on the way, who is looking for a certain girl under orders from his boss. Unable to find any Zombrex, Nick loses all hope until Gary notices that his wound has healed, revealing that he is somehow immune from turning. Realizing that the girl Gary is looking for is actually Annie, Nick agrees to help him retrieve her in exchange for fuel for the plane. Nick then tracks her down but fails to convince her to come with him. The leader of her group, Red, tells Nick that the military is in fact not evacuating survivors but killing them off instead, and Nick agrees to help them in exchange for the fuel he needs. After retrieving some evidence of the military's crimes, Nick learns from Red that all of his friends, including Annie, were captured by them.
While infiltrating a military encampment to rescue the captives, Nick learns that government officials General Hemlock and Marion Mallon are responsible for the outbreak and witness them turning the U.S. President into a zombie as well to assume full control of the government. After rescuing the captives, Nick learns that the government is offering five million dollars as a reward for anyone who captures certain individuals with numbers tattooed on their neck, like him and Diego. Having finally obtained the fuel from Red, Nick returns to Rhonda and Dick only to find out that a deranged Diego has fled. Nick confronts him at the museum and has him return to his senses. After retrieving parts for the plane Nick learns from Rhonda that she is not going with them because she wants to stay and attempt to reconcile with her ex-husband. Nick then leaves to round up the other survivors but he and Diego are captured by the military. Nick awakens in a room, restrained next to Diego, who is killed in front of him, and the hundreds of parasitic wasps and larvae swarming out of his body create a confusion that allows him to escape, meeting Isabella Keyes on the way, who reveals that he is the one the military is looking for because of his immunity. After surviving an attack from Mallon, Nick discovers that Gary had captured Annie and he refuses to let her go. However, upon learning that Gary is actually Rhonda's ex-husband, Nick have the two reunited in order to rescue her.
Once reunited with the others, Nick learns from Isabella that he, Diego and other orphans born from U.S. soldiers stationed in Santa Cabeza were experimented upon by her brother Carlito in order to become live biological weapons, with each of them carrying the parasite. However, Nick is immune to it instead, and he must leave the town alive in order to have a cure developed. Interested in the reward for Nick, Red turns on the group and fights him. After Red is killed, Nick uses a transceiver, and pretending to be a military agent, tells Hemlock that they need more time to apprehend him. The general agrees, extending the time before the bomb deployment by an extra day. Nick and Annie end up kissing. Soon after, Chuck Greene arrives with Rhonda and Gary, revealing that Annie is actually his daughter Katey and that Gary was working for him. Chuck had turned to a life of crime in order to provide Zombrex for his daughter, but this led to his daughter running away from home. Chuck and Annie reconcile. Gary and Rhonda volunteer to stay and help rescue any remaining survivors before leaving the city.
As Nick is about to take off with the others, he overhears on the radio that Hemlock is planning to create a biological weapon with the zombies. Nick and Chuck then decide to team up to stop Hemlock's plan before escaping. After Hemlock kills Mallon upon being angered by her disrespect, he proceeds with the extraction of king zombies from the city, but Nick and Chuck stop him. The General is ultimately killed in a confrontation with Nick, who escapes the city with the others, leading to the creation and distribution of a cure to the zombie infection. After the credits, it is revealed that Isabella was truly responsible for the outbreak, convincing Mallon to begin it so that the carrier of the immunity would be revealed, and successfully making herself the creator of the cure while clearing her family name from Carlito's crimes in Willamette. Back in the present, Isabella destroys some evidence incriminating her and leaves the city with the others, satisfied that her reputation and future is now safe.

Alternate endings

Like the previous games, Dead Rising 3 has multiple alternate endings that can occur, depending on the player's choices in the last chapter of the game and if the main campaign is completed before the bombing of Los Perdidos begins. The summary above is the canon ending, Ending S, unlocked if the player follows Nick's morals in the game. (Note: Unlike previous games, Ending A is the ending that leads into Chapter 8 and Ending S, making Ending S the true ending and Ending A the "gateway" true ending.)
The other endings are:

Ending C (Complete all chapters and kill Gary at the club instead of finding Rhonda)
After Red is killed, since Gary is dead, he, Rhonda, and Chuck do not show up. Isabella runs up to Nick and Annie exclaiming that they have to leave immediately and they board the plane, but it stalls as they try to take off and are overrun by zombies. The end text states that Hemlock was arrested for his actions; however the parasite infection continued to spread, and rumors of Carlito's "immune orphan" were never proven.
Ending D (Complete chapters 1 - 6 and escape the Metro Station, but go straight to the plane instead of the club where Annie is being held hostage)
Nick decides to leave the city by himself, but is discovered by Rhonda, Annie, Red, and Gary, who leave him behind as they escape the city using the plane. The end text states that no survivors were found and the outbreak was the beginning of the end for the United States, as the West Coast went under martial law. Hemlock created his biological weapon from the mutated zombies and caused outbreaks all over America and rumors of Carlito's "immune orphan" were never proven.
Ending F (Do not complete all the chapters by time the firebomb is scheduled at the end of the 7th day)
A cutscene plays of the city being destroyed by incendiary bombs. The end text states no survivors were found, Hemlock succeeded in creating his biological weapon from the mutated zombies, and America was put under martial law.
Overtime Alternate Ending (Fail to stop Hemlock's harvesting of the mutated zombies in chapter 8)
Hemlock declares success and escapes the city. The end text states that Los Perdidos was destroyed by incendiary bombs and Hemlock created his biological weapon from the mutated zombies and rumors of Carlito's "immune orphan" were never proven. Getting this ending will result in a game over screen, and the player can choose to return to the last checkpoint and try again in Overtime Mode.
Ending X (Scrapped; intended to be triggered if Nick kills too many survivors)
After defeating Red, Nick and Annie hug each other. Annie thanks him for saving her, before revealing that she knows of Nick’s wrongdoing. A group of survivors appear: Joey is unarmed, Hank is wielding a spiked bat, Kyla has a crowbar, Kent DeMare is armed with a whisky bottle and one additional unused survivor has a lead pipe. Nick tries to explain that he is special, which makes the survivors angrily question him. Nick pleads with them that he needs to escape before Annie lets him know that he will be in the “Safehouse in the sky”. Nick tries to run, but is knocked down and beaten by the survivors before the final blow is stricken by Hank with the spiked bat.