Marty the Zebra (Rock), a neurotic resident of the Central Park Zoo, suffers
from an identity crisis—is he black with white stripes or vice versa?—and runs
away from his coddled lifestyle. When his three pals catch up with him at Grand
Central, the conspicuous quartet is captured by animal control and somehow ends
up on the title island, a vivid paradise inhabited by a pack of raving lemurs.
Trouble arises, however, when Alex the Lion (Stiller) and his carnivorous
instincts are awakened. Lame scatalogical gags and worn pop-culture parodies
abound, but the CGI animation romp is somewhat redeemed by the scene-stealing
appearances of several supporting characters.