NBC’s “Saturday Night Live” had gotten off to a sluggish ratings start this fall, but rebounded last night as the combo of Chris Rock and Prince boosted the show to its top overnight rating since last winter.

“SNL” averaged a 4.9 household rating/12 share in Nielsen’s 56 metered markets, and a 2.4/10 in adults 18-49 in Nielsen’s 25 homes with Local People Meters. The show hasn’t fared better in household overnights since Feb. 1 (Melissa McCarthy/Imagine Dragons) and in the demo since March 1 (Jim Parsons/Beck).

The previous “SNL” high this season was the previous week’s 4.1/10 in the overnights and a 2.2/10 in adults 18-49, which translated to 5.42 million total viewers and a 1.91 demo rating (tied with the season premiere as the season high).

This is the 40th anniversary of “Saturday Night Live,” with NBC planning a big primetime special for Feb. 15. Woody Harrelson is next up as host, on Nov. 15.