Television December 03, 2021 See a Dream-Come-True Moment for a ‘Harry Potter’ Fan in ‘Hogwarts Tournament of Houses’ Sneak Peek “Extra” has a sneak peek from Sunday’s episode of “Harry Potter: Hogwarts Tournament of Houses”! In the video, master of ceremonies Helen Mirren surprises contestant Ryan, a mega fan of Albus Dumbledore, with the chance to try on the wizard’s hat. Watch! This week the Ravenclaws go up against the Slytherins for a chance to compete in the grand finale. Tune in to TBS and Cartoon Network on Sunday at 8 p.m. to catch the action.