Oswald the Rabbit and his (rabbit) girlfriend go to an amusement park but Oswald's dog is refused admittance. This does not set well with the pooch so he sneaks in through a trap-door that comes up into the shooting gallery, The park police are soon chasing Ozzie's dog through the skating rink.
Film portrays the expedition of the British explorer David Livingstone to Africa to discover the source of the Nile, his disappearance, and the expedition to find him led by Stanley.
Oswald the Rabbit and his little brother catch the Slumberland Express and it carries the assorted animals to childhood's dream of paradise - an amusement park where all the games are free, and windows are provided just to be broken by an abundant supply of free rocks, and old men wear silk hats to provide targets for snowballs.
A newly hired police chief vows to clean up a notoriously corrupt police department. When he is murdered, investigators find that there is no shortage of suspects, most of them being fellow cops.