It is based on both the five movies and the comics. There are six episodes with six levels in each one.
Main Playable characters
Cyclops Jean Grey/Phoenix
Magneto and the Brotherhood
Episode 1 First Class: 1963 - How Xavier and Magneto started the X-Men then becoming enemies. (loosely based on X-Men: First Class ).
Episode 2 The Origins of Wolverine: From when he discovered his powers, to meeting Styker, to becoming enemies with Sabretooth, to when he lost his memory. (loosely based on X-Men Origins: Wolverine ).
Episode 3 X-Men: Wolverine joining the X-Men, now with Professor Xavier, Storm, Cyclops and Jean Grey/Phoenix, and introducing Magneto and the Brotherhood as villains. (loosely based on X-Men ).
Episode 4 Stryker Returns: The X-Men and Magneto and the Brotherhood team up briefly against William Stryker. Also involves the Sentinels. (loosely based on X2: X-Men United ).
Episode 5 Dark Phoenix: Magneto and the Brotherhood attempt to steal Jean Grey/Phoenix as Dark Phoenix is about to unleashed. (loosely based on X-Men: The Last Stand ).
Episode 6 Magneto's Last Stand: Magneto and the Brotherhood try to destroy the X-Men one last time.
Episode 7 the great escape: Magneto is stuck in a pit and Brother hood has his helicopter and took Magneto
Boss: Magnetos Helicopter and Brother hoods Motorcycle Brotherhood and Magneto and Doom Bots
Heros: Wolverine Wolverines Cannon Wolverines Quin Jet Jean grey Jean Greys Bomb Jet and Jean greys Death ray