AllMovie

When Jim sees a picture of the mythical Giant Fur-Bearing Trout, he decides that he must see the fish with his own eyes, taking Peter along for an involuntary road trip. Meanwhile, Professor Monkey-for-a-Head presents Queen Slug-for-a-Butt with his latest secret weapon -- one that requires the hair of the Giant Fur-Bearing Trout for power. When Princess What's-Her-Name learns of her sister's nefarious scheme, she also speeds off to reach the Trout in time.