Rex must prevent Van Kleiss and his minions from gaining unprecedented powers that could destroy the Earth Multi-Head, Biowulf and the Heart of Aquania appear in the game, as supporting villains
When Rex goes on a mission to defeat the EVO, Multi-Headed EVO, he discovers a piece of a blueprint which later is stolen by Breach
This causes Rex to lose some of his new builds He reports this happening to Providence and goes to the Jungle A piece of the blueprint is located in Dr Rylander's lab, where Rex copies Rylander's data He is then quickly attacked by the "Rabbit EVO", who he later defeats Breach steals the blueprint again, as Rex returns to Providence Afterwards, Rex goes to Hong Kong with Bobo Haha to stop Quarry (Rex's original boss) from stealing items, including a piece of the blueprint To Rex's interest he encounters his romantic love, Circe He finds out that she is working for Van Kleiss, again, as he helped her escape from him
