Stuart Craig, who created the look for all of the Potter films, designed new outdoor environments for the Triwizard Tournament and impressive outdoor sets that includes the camp at the Quidditch World Cup and an enormous graveyard.

Creature effects supervisor Nick Dudman built a full-size animatronic dragon, while costume designer Jany Temine designed hundreds of ball gowns for the movie's centerpiece, the Yule Ball.

The fourth film also marks the first on-screen appearance of Harry's arch-nemesis, the dark wizard Voldemort, as played by Ralph Fiennes, although the way he'll show up in the movie is the biggest secret at Leavesden these days.