Superdog Sweep takes on strongman Geoff Capes, and then has to rescue some children from a runaway truck. Sooty, Sweep and Soo are fast asleep in bed, with each of them dreaming. Both Sooty and Soo dream about being conductors, while Sweep dreams that he is a superhero, by the name of Superdog! At breakfast Matthew explains that the world's strongest man, special guest, Geoff Capes is giving a demonstration of his strength later on that day.