Watch the trailer for 'Harry Potter: Hogwarts Tournament of Houses'

"This is the night you've been waiting for," Mirren teases in the 70-second clip. The 76-year-old Triple Crown-winning actress goes on to explain that Gryffindor, Hufflepuff, Slytherin and Ravenclaw will be represented by fans who compete in head-to-head trivia matchups "about all things Potter."

The first episode, airing Nov. 28, will feature Gryffindor facing off with Hufflepuff, beginning at 8 p.m. on TBS and Cartoon Network.

Throughout the series, special guests such as Harry Potter stars Tom Felton (Draco Malfoy himself) and Shirley Henderson as well as the likes of Pete Davidson and Jay Leno.

Nov. 14 will mark the 20-year anniversary of Harry Potter and the Sorcerer's Stone's theatrical release in the United States—the first installment in the iconic eight-part film franchise fronted by Daniel Radcliffe, Rupert Grint and Emma Watson. The movies, of course, were adapted from J.K. Rowling's novel series.

Mirren was announced as the commemorative competition series' host last month.

"I knew someday I'd get a Harry Potter role, and I'm so pleased to take part in the 20-year film celebration," she said at the time, per Variety. "The films inspired such enchantment and wonder for so many of us, and it will be such a treat to reignite that magic for the countless fans who continue to revel in this spellbinding world."

Hogwarts Tournament of Houses will be available to stream on HBO Max at some point, too.