King Cup sends his two sons Bric and Brac to capture Polly and bring her back to The Flying Sorcerers' Planet. She is to be their new baking slave. Polly is caught by the two royals, but gets off a call to Underdog for help. After seeing his true love being captured by the aliens, Shoeshine Boy runs into a phone booth and becomes Underdog. Bric and Brac use their evil space magic to turn our hero into a basketball, and Underdog is sent bouncing along into a kid's basketball game. Polly is brought before King Cup- what will her fate be?