Pete Davidson, Kate McKinnon, Aidy Bryant and Kyle Mooney's signature 'SNL' moments

"Saturday Night Live" bid farewell to Kate McKinnon, Aidy Bryant, Pete Davidson and Kyle Mooney on Saturday. Here's a look at some of their classic humor on the show.

The episode, hosted by Natasha Lyonne, began with a cold open with McKinnon playing Coleen Rafferty in "Close Encounter," her recurring skit in which aliens abduct her and things get freaky. In the season finale, McKinnon agrees to leave Earth forever in the name of research, and boards a space ship with tears in her eyes.

"Well, Earth. I love you, thanks for letting me stay awhile," McKinnon said.