8 Actors Who Totally Transformed Themselves For Upcoming Movies

5. David Harbour (Hellboy)

Stranger Things star David Harbour was quite the casting surprise when he landed the part of Hellboy in the upcoming franchise reboot.

However, most fans seemed convinced once the first picture of Harbour in character surfaced online, showing him looking nothing like his usual self and bearing a surprising resemblance to Ron Perlman's beloved iteration of the superhero.

Harbour isn't an actor exactly known for his chiselled physique, so to see him in such ridiculous shape was quite the shock. The actor has admitted, though, that he had the help of a prosthetic muscle suit, despite being put on a 10-week boot camp with one of Hollywood's best personal trainers.

Whatever the means, Harbour totally looks the part, and if you saw the picture free of all context, you'd probably never guess it was him.