The Green Bay Packers QB and likely 2020 NFL MVP, who idolized Alex Trebek growing up, says he's signed on to guest-host one episode. Rodgers won Celebrity Jeopardy! in 2015, beating astronaut and now-U.S. Sen. Mark Kelly and Shark Tank's Kevin O'Leary. Rodgers joins fellow guest Jeopardy! hosts Ken Jennings and Katie Couric.