The Tan Aquatic with Steve Zissou is episode 11 of family guy season 05. It was originally aired on February 18, 2007.
When a bully begins to harass Chris, Peter goes to his defense, but the kid is so annoying that Peter beats him up. This is so satisfying that Peter realizes bullying is fun and begins to bully everyone in the house. Finally, Chris stands up to Peter and beats him senseless. Meanwhile, Stewie goes out without sunscreen and becomes obsessed with getting a tan. After Brian accidentally leaves him in the tanning booth for six hours, Stewie gets sunburned and fears he has cancer. While waiting for the results of his cancer screening, Stewie begins to live his life as if he had only days to live and drives Brian crazy with his demands.