When the whirlpool in Potamus' office sucks them back into pre-history, Harvey, Potamus, Peanut and Phil must find their way back to the office. Or rather, Harvey must find his way back. Phil wants to stay to exploit the untouched natural resources.

Peebles is sued when a group of animal rights activists break into his store, free all the animals and kidnap Magilla. In the meantime, Phil takes Potamus and his nephews on a fishing trip in hopes of either communing with or totally obliterating nature.