Bertram Griffin is a major antagonist in Family Guy. He is the younger half brother of Stewie. He is voiced by Wallace Shawn.
He was once in Stewie's dad testicles where he fought Stewie to make no baby came out of Peter. He didn;t make it but he was given birth a.k.a sperm, He challenged Stewie to a contest and while after a fight he was defeated. When he learned of Stewie's time machine, he decided to kill Stewie's ancestor not giving a damn about erasing the universe; he was killed by Stewie.
He returned and he was ready to seek vengeance on Stewie, but he settled for The B Team, friends of Stewie, so he got his vegeance. He was responsible for Flapjack's whale death and during, he wounded Flapjack with a gun, but he himself was killed by the Shadowness.
Gavin's Purgatory Journey[]
During the climb, Gavin saw both Stewie and Bertram at the Avarice terrace; since "the fat man" and the "red-haired woman" were already slewed and damned, they had no reason to dominate each other. As they were attempting to get purified, they remained the best of friends.