Saturday Night Live returns from its Olympics-imposed hibernation March 1, and the NBC late-night show said today Jim Parsons as host with musical guest Beck. It will mark the hosting debut for The Big Bang Theory star — sort of. Jimmy Fallon did a mean Jim Parsons imitation in the winter finale in December. This is what Parsons will have to compete with when it’s his turn: Should we take bets if he gets to rebut the new Tonight Show host?