Sneak peek: Katie Holmes as the Slutty Pumpkin on "How I Met Your Mother"

(CBS) It's been seven seasons in the making, but the Slutty Pumpkin is finally here.

CBS has released a preview of Monday night's episode of "How I Met Your Mother," in which Katie Holmes plays the be-costumed woman.

Slutty Pumpkin was first referenced - in name only - on the first season of "HIMYM," when Ted talks about meeting her at a Halloween party.

Monday night's episode, which airs at 8 p.m. on CBS, flashes back to that party and shows Ted meeting the mystery girl.

"I'm gonna go make some Tootsie Rolls," she says in the clip. "It's a drink I invented. There's a song and dance that goes along with it, but I have to drink three of them before I can do it."

Tell us: What do you think of Katie Holmes as the Slutty Pumpkin?