In London Zoo, Professor Darrylhyde is singing to the apes again. Outside their cage, he watches the two animals, longing to observe the mating ritual of this rare species. But Percy, inhibited by confinement and melancholy, is repulsing Edwina's desirous advances. Soon, the Professor's connection increases as he talks, croons, befriends - so when a scientist arrives on a secret governmental mission to launch Percy into space, he vows to secure his freedom. But when met by society's indifference, he takes matters into his own hands.