Episode: Season 9: Episode 16 – The Big Bang Theory
Description: Stewie and Brian go back in time to stop Stewie's half-brother Bertram from killing Leonardo da Vinci, which would erase Stewie from the universe.
First Aired: May 8th 2011

More Episodes: Episode 1 – Episode 2 – Episode 3 – Episode 4 – Episode 5 – Episode 6 – Episode 7 – Episode 8 – Episode 9 – Episode 10 – Episode 11 – Episode 12 – Episode 13 – Episode 14 – Episode 15 - Episode 17 – Episode 18