Popsugar Entertainment Harry Potter Harry Potter and Game of Thrones Crossovers 8 Harry Potter/Game of Thrones Crossovers That Might Blow Your Mind a Little October 12, 2017 by Shannon Vestal Robson View On One Page Photo 2 of 17 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 2 Jim Broadbent as Professor Horace Slughorn Broadbent played the potions professor who unlocked key secrets for Harry. Previous Next Start Slideshow Harry PotterGame Of ThronesTVMovies