Conversation so far:
What does Stewie B. Goode have to do with Stewie Griffin: The Untold Story?
Stewie Griffin: The Untold Story is a 2005 film. Fox aired the film as three episodes – Stewie B. Goode, Bango Was His Name, Oh!, and Stu and Stewie's Excellent Adventure.
How did Lois Griffin revive Stewie Griffin in the episode Stewie B. Goode?
What was Stewie Griffin doing when he had to be revived in the episode Stewie B. Goode?
Stewie tries to kill Brad.
Why was Stewie Griffin trying to kill Brad in the episode Stewie B. Goode?
Stewie decides to try and outdo him in a swimming race. He nearly drowns in the process, while Brad finishes in first place.

Question: What does he try to do to steal Brad's glory?
Self-contained rewrite: What does Stewie Griffin try to do to steal Brad's glory in the episode Stewie B. Goode?