[Though not the night's musical guest, a game but initially nervous Katy Perry sang her way through the show—as Christina Aguilera, as Florence and the Machine, as Pippa Middleton, and herself. Darrell Hammond, whose memoir was released last month, appeared in the cold open as Donald Trump. Also making cameos were Matt Damon, Val Kilmer, and Alec Baldwin (in damage control mode for his American Airlines incident). Musical guest Robyn performed "Call Your Girlfriend" and "Dancing on My Own."]

Some highlights...

From the makers of Valentine's Day and New Year's Eve ... it's Apocalypse, starring "literally thousands" of your favorite celebrities—from Drew Barrymore (Kristin Wiig) to Penny Marshall (Fred Armisen) to "that kid from Modern Family" (Bobby Moynihan):

Digital Short—Andy Samberg and Katy Perry join new friends Handsome Homeless Guy (Matt Damon) and Brilliant Lunatic (Val Kilmer) for holiday activities like "paying for meth with sexual favors" and Russian roulette:

"American Airlines pilot Steve Rogers" drops by Weekend Update to apologize to Alec Baldwin. ("Mr. Baldwin is an American Treasure... He was playing not just any game mind you, but a word game for smart people..."):

Katy Perry appears on Kalle, the Finnish talk show where host Kalle (Kristin Wiig) has a clip for everything:

Stefon recommends New York's hottest night spots for families in town for the holidays. (Habitués include Fat Sajak, "the Russian guy in a Cosby sweater," and Hanukkah cartoon character "Menorah the Explorer"):

Also: Meatloaf (Jason Sudeikis), Clint Eastwood (Bill Hader), Florence + the Machine (Katy Perry), and others promote their soundtrack for the new movie Doggie Duty ("Dogs will do anything for love... but they don't like cats..."); Flirtation expert Rebecca Larue (Kristin Wiig) shows Seth Meyers her moves; and lonely lady Katy Perry finds soulmate Bobby Moynihan, an English professor specializing in the poetry of Jewel.

NEXT WEEK: Jimmy Fallon, with musical guest Michael Bublé.