The game focuses on four zoo animals, Marty the zebra, Alex the lion, Gloria the hippo and Melman the giraffe. The story of the game begins on Marty's tenth birthday. Marty starts to have doubts that the zoo is where he belongs, and is determined to find the right place. That night, a penguin named Skipper gives Marty directions of how to escape the zoo, but Marty is discovered, and encounters the night time security guard, the Zoo Hunter. After defeating him, Marty successfully leaves the zoo.