Intro Level. Characters: Captain America, Iron Man, War Machine, Thor, Sif, Wolverine, Proffessor X, Beast, Cyclops, Jean Grey, Storm, Night Crawler, Spider-Man, Hulk, She-Hulk, Ant-Man, Wasp, Human Torch, Mr. Fantastic, Invisible Woman, The Thing, Hawkeye, Black Widow and Nick Fury. Boss: Super Skrull. (20 hearts) Enemies: The Skrulls. Captain America's Story: Level 1. Red Skull Rampage. Characters: Captain America, Iron Man, Thor and Hulk. Boss: Red Skull. (6 hearts) Enemies: Hydra Agents. Level 2. Crossbones Attacks. Boss: Crossbones. (10 hearts) Enemies: Hydra Agents. Level 3. Vicious Viper.