JOHN MULANEY returned to “Saturday Night Live” to host for a third time — but let the audience know there was no special reason for such a gig.

“I have nothing coming up; I am here to promote the month of March,” he said during his monologue. Though he never appeared in the cast, Mulaney wrote on the show for six seasons.

His first sketch of the night parodied “The Sound of Music,” with Mulaney playing Rolf and Cecily Strong played Liesl. They sang a parody version of “Sixteen Going on Seventeen,” in which Rolf confessed to being significantly older than he had initially told her. “Honestly, when I first came to the house, I thought you were the mom,” Mulaney’s Rolf said, assuring her that she’s mature for her age.

Another sketch had Mulaney going off on his nephew, Pete Davidson, for turning him into a meme — one featuring Mulaney in an awkward office photo with a caption reading, “When she wanna smash but the pee-pee too small.”

In a digital short, Mulaney made fun of cast member Kyle Mooney for being a nerd who couldn’t appear in a sketch about male strippers. Mooney worked out excessively for the sketch, only to learn in the end it was changed to feature nerdy men.

Kate McKinnon and Aidy Bryant appeared in a sequel to their sketch “The Corporal,” a black-and-white classic movie parody in which they play sisters trying to kill each other over their competition for a man’s affection. Mulaney appeared as a young sailor in the sketch who also caught the attention of the Corporal, played by Beck Bennett.

Near the end of his “SNL” return, Mulaney created a trilogy to his successful musical sketches, “Diner Lobster” and “Bodega Bathroom,” with one parodying various musicals while poking fun at LaGuardia Airport. Jake Gyllenhaal made a guest appearance for the sketch, singing as a man who wears pajamas to the airport and actually enjoys being searched by security.

(SD-Agencies)