X-Men: Return Of The Past is a movie based on the superhero team, The X-Men, it is a sequel to X-Men: The Incident.
in present-day, Chicago, Illinois, Charles Xavier asks Magnus Eisenhardt if he remembers the old days, Eisenhart is confused why he asked that question, Xavier asks why Eisenhardt thinks Harry called him up, Eisenhardt answers saying it was because Harry needed help, Xavier then asks help with what, Eisenhardt has no idea what Harry needed help with, Xavier then answers the question, "Max, he's back", surprised, Eisenhardt walks away before gasping in shock.
in 1977, Stuttgart, Magnus, Charles, Harry, and their friends, Guido Carosella, Buford, James Bradley, Vincent and Jason are in a mutant base, where they encounter Sebastian Shaw and the demon Azazel who are building a team of Mutants Called The Hellfire Club, Jason, Harry, Magnus and Vincent decide to join The Hellfire Club with James, Buford, Guido and Charles staying behind and escaping, 3 years later.
years later, Bradley is working as a physician and Buford is a trucker, they are both called to the base of The X-Men by Harry, Charles, Magnus and Guido who now works for them as a bodyguard, Buford is looking for his sister who gone missing during Mesmero's rampage, Mesmero was the name Vincent took after turning against the Hellfire Club which is when Charles formed the original X-Men consisting of Cyclops, Jean Grey, Beast, Angel and Iceman, Mimic soon joined after, Jean, Scott and Hank go on the search for Angel and Iceman, Angel and Mimic, Mimic is leading a secure camp of Mutants which isn't going so well, Angel attacks Jean, Scott and Hank not recognizing them, they then meet up with Mimic and Iceman.
Wolverine escapes custody from Mesmero and finds Storm in the woods, they rest there and fall for each other, Charles then finds them in the woods with Wolverine's ex, Silverfox, Mesmero attacks the Base, as Storm, Charles, Wolverine and Silverfox, ForgetMeNot and Phat, two mutants from Mimic's camp, help them get back to the Mansion, Azazel is Nightcrawler's father and he doesn't want to harm him, Shaw confronts Charles and Harry, stating that they had a deal, Charles denies that and they meet back up, Caliban falls down into the underground and meets Callisto, a ninja who leads a team called The Morlocks, Callisto and Caliban then leave the underground and start seeing the crazy things happening to the people, the mutant academy mutants are forced to fight, ForgetMeNot was actually on the team for a very long time, Mastermind takes ForgetMeNot on a mission, ForgetMeNot kills Shaw betraying Mastermind, Mesmero then attacks but is soon sent away in a spaceship and sucked up into a vacuum.
In a post-credits scene, S'ym, a demon saves Mesmero and introduces Joseph, a clone of Magneto.
Kit Harington as James "Logan" Howlett / Wolverine: a skillful mutant with a dark past, James ended up killing his parents as a kid, he develops feelings for Storm.
Naomie Harris as Ororo Munroe / Storm: a Kenyan mutant with the power to control the weather, she develops feelings for Wolverine.
Chris Sarandon as Buford Hollis / Razorback: a mutant feeling disgraced because of his power that he can drive any vehicle, looking for his missing sister, he is also an old friend of Magnus, James, Charles, Vincent and Guido.
John Krasinski as ForgetMeNot: a mutant who has the power to make people constantly forget him.
Harry Lloyd as Calvin Rankin / Mimic: a mutant who can copy powers.
Patton Oswalt as William Robert "Billy-Bob" Reilly / Phat: a mutant with the power to decrease in size, weight, and muscle.
Nick Nolte as James Bradley / Doctor Nemesis: a mutant physician and an old friend of Charles and Magnus.
Asa Butterfield as Japheth / Maggott: a mysterious South African teenage mutant with a slug-based digestive system.
Sam Spruell as Jason Wyngarde / Mastermind: an old friend of Charles and Magnus and a member of the Hellfire Club.
Claudia Karvan as Silver Fox: Wolverine's Native American ex-girlfriend with an accelerated healing factor.
Simon McBurney as Piotr "Peter" Rasputin / Colossus: a Russian mutant with the power to turn his body into metal.
Ewan McGregor as Robert "Bobby" Drake: one of the original X-Men members and a mutant who can control ice.
Ciara Bravo as Katherine "Kitty" Pride / Shadowcat: a mutant who is able to run, walk or levitate through walls.
Isabela Moner as Illyana Rasputin / Magik: Colossus' younger sister and a mutant sorceress.
Jack Whitehall as Douglas Ramsey / Cypher: a mutant capable of translating any language into English.
Zac Efron as Warren Worthington III / Archangel: a mutant and former member of the original X-Men with metal wings given to him by Apocalypse, he used to be known as Angel.
Ben Whishaw as Jamie Madrox / Multiple Man: a mutant with the power to clone himself.
Mr. T as Lucas Bishop / Bishop: a time-traveling mutant policeman with super-strength.
Channing Tatum as Remy Etienne LeBeau / Gambit: a gambling-obsessed mutant with the power to transfer kinetic energy into physical objects.
Lucy Boynton as Jean Grey: Cyclops' girlfriend and a powerful telepath.
Lily James as Anna-Marie LeBeau / Rogue: Gambit's wife and a mutant who kills people with a simple touch.
Donald Glover as John Wraith / Kestrel: a teleporting mutant who is an expert marksman.
Ralph Fiennes as Charles Xavier / Professor X: the leader and teacher of the X-Men.
Mark Addy as Sebastian Shaw: the determined leader of the Hellfire Club and a criminal.
Danny Dyer as Gabriel Summers / Vulcan: a mental patient and former member of the X-Men.
Ian Hart as Adam Neramani / Adam X The X-Treme: a half shi'ar, half mutant member of the X-Men with the power to ignite oxygenated blood.
Justin Timberlake as Kurt Wagner / Nightcrawler: a teleporting mutant, the son of Azazel and Mystique.
Tim Roth as Azazel: a tyrant and Nightcrawler's demonic father.
Diego Luna as Caliban: an albino mutant who now lives underground with a team called the Morlocks
Anna Kendrick as Callisto: a member of the Morlocks who's a skilled ninja.
Oliver Ford Davies as Max "Magnus" Eisenhardt / Magneto: Professor X's former best friend and a member of the Hellfire Club.
John Magaro as Scott Summers / Cyclops: Vulcan's brother, a mutant with the power to shoot lasers from his eyes, it's broken though so he needs glasses so he can control it.
Jennifer Lopez as Jubilation Lee / Jubilee: a mutant who uses music to power pyrotechnic, psionic and telepathic abilities.
Todd Allen Durkin as Harry Leland: the black bishop of the Hellfire Club, an old friend of Charles and Magnus.
Kelsey Grammer as Henry "Hank" McCoy / Beast: a mutant scientist who accidentally turned himself into a blue simian form.
Hulk Hogan as Guido Carosella / Strong-Guy: a mutant with super-strength who serves as the X-Men's bodyguard, shown to be an old friend of Magnus, Vincent, Charles, James and Buford.
Kate Winslet as Allison Blaire / Dazzler: a mutant with the power to turn song into light.
Peter Serafinowicz as Vincent / Mesmero: a mutant with the power to brainwash people, mind control people as well as reality-warping powers.