You will watch The Simpsons Episode 309 Saturdays of Thunder online for free episodes with high quality. Online episode guide, The Simpsons Episode 309 Saturdays of Thunder Saturdays of Thunder After taking a fatherhood quiz, Homer realizes that he knows nothing about Bart, and in the result, strives to be a better father after learning that Bart is one of the racers in the Soapbox Derby. Their entry is not very good, and Bart decides to drive Martin Prince’s much nicer racer. Homer is at first devastated, but decides that he must be a good father and support Bart. Bart later goes on to win the race.