He's the former Murray software engineer who gutted every "Jeopardy" contestant in his path during his record-setting run on the popular game show in June 2004.
Who is Ken Jennings?
Jennings, who is now a New York Time best-selling author, is back in this interactive video quiz made by the people at social media news site, Mashable. It's to celebrate the 50th anniversary of the show. See if you can answer all of the questions and get to the surprise at the end. Good luck!