At first, Kirzinger was Jason's stunt double in the 1989 film Jason Takes Manhattan. He returned for Freddy vs. Jason and played the killer during the entire film. There was something about Kirzinger's body language that made him so scary... Much scarier than the previous Jason's. His acting made the film pretty enjoyable compared to the other ones.
Leatherface - Andrew Bryniarski
Leatherface was slotted to be played by someone else, but the first actor had to drop. The studio decided to call Andrew Bryniarski to fill the role, which worked out incredibly well. He truly embodies the scary villain!
Bryniarski is a bodybuilder (no shock there) but is nothing like the villain himself. In fact, he was so against the "idea" of Leatherface that he refused to stay in character between takes. He didn't want anyone to think he had a bad bone in his body!
Pennywise the Dancing Clown - Bill Skarsgård
Bill Skarsgård portrays the newest version of Pennywise the Dancing Clown in the 21st Century remake of Stephen King's It. The Swedish actor did everything he could to make this character as terrifying as he was on screen. Pennywise is easily the creepiest character out there already (clowns, right?) but somehow, Skarsgård made him bone-chillingly terrifying. It was probably that perfect smile...