Altered Beast features a Greek mythology theme as players take on the role of a warrior brought back from the dead by Zeus. The ruler of the gods needs you to rescue his daughter, Athena, from Neff, the Lord of the Underworld, so he grants you the power to morph into mythical beasts. Four levels (Werewolf, Weredragon, Weretiger, and Gold Werewolf) represent the beasts you can change into, but in order to morph, you first need to obtain two Spirit Balls, released by white wolves after you defeat them.