← Previous Next → 9x16 The Big Bang Theory 4/5 (5 votes) First Aired: May. 08, 2011 on FOX Summary: Stewie and Brian go back in time to stop Bertram from killing Leonardo da Vinci

Main Characters in this Episode

• Peter Grif…
• Stewie Gri…
• Brian Grif…
• Tom Tucker
• Lois Griffin
• Chris Grif…

• Meg Griffin
• Cleveland …

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Guest Stars Glenn Quagmire voiced by Seth MacFarlane Leonardo da Vinci voiced by Seth MacFarlane Additional Voices voiced by Seth MacFarlane Stephanie voiced by Alex Borstein Vatican Messenger voiced by Joe Flaherty Bertram voiced by Wallace Shawn