Tour guide Jungle Jed tells the gorillas to go to bed, but they can't seem to stop playing.

Willy the Gorilla imitates the other animals at the zoo, but despite pretending he remains always a gorilla.

Even though the city faces nightly air raids, in 1941 Joseph is sent to London to live with the gruff Mrs F, who teaches the angry boy how to care for the remaining animals in the city zoo, including a mighty silverback gorilla named Adonis.