Tubby; Mrs. Tompkins (his mother); Mr. Tompkins (his father); Wilbur; Gloria; Mr. Van Snobbe (Wilbur's father); Willy; Eddie; Iggy
After the Van Snobbes have $50,000 in jewels stolen from their mansion, Tubby goes there in disguise to investigate. After causing a commotion there, he is ordered home and is punished by having to stay in his room. Late at night he awakens to see a lion apparently walking across his back fence. The next morning he sees Gloria going to pick wildflowers in the woods and warns her that there are lions in the area. She disregards him, but that evening comes the report that she is missing. Tubby grabs a chair, in the best lion-tamer tradition, and goes to the woods to find her. He meets up with a lion and in his panic falls into a dry well. Also in the well is Gloria, bound and gagged. Tubby and Gloria escape from the well, only to run into the two men who had captured Gloria in the first place. Tubby leads the pair's escape across a swamp, where the two men are mired in quicksand. Tubby and Gloria lead the police back to the two men and with Tubby's help the mystery of the lions and the stolen jewels is solved.