Best Bets on TV tonight

“Supernatural” (9 p.m., The CW): “Supernatural” has reached 100 episodes, and it still gives us the creeps. Tonight, Sam and Dean are horrified when they learn of the angels’ new game plan.

“Saturday Night Live in the 2000s: Time and Again” (9 p.m. NBC): This is a retrospective of the sketch show’s signature moments from the recent past. Included are appearances by Will Ferrell, Tina Fey, Jimmy Fallon and others.

TV Listings, B6