Betty's fearful trip to the dentist to deal with a cavity is interrupted when she is called off to save the galaxy from the evil alien baby Infantor, who is draining magma from planets to mold to create action figures/ Sparky is chosen to compete in a new "Fear Factor" style game show, but something is not right. Maximus is behind the game show, and is rigging it so that Sparky wins! On Earth, Betty tries to stop her parents from selling her sci-fi posters and books at a yard sale.