From Thomas F Wilson in Back To The Future to Nicolas Cage and John Travolta in Face/Off - when actors play multiple roles...
The dramatic use of actors playing multiple characters is a bold and rather theatrical device that has its ups and downs. It goes at least as far back as Captain Hook being played by the same actor who plays the Darling children's father in stage productions of Peter Pan, a technique largely adopted in film adaptations of the story, too (hello to Jason Isaacs).
It's used a lot in cinema too. Done well, it's impressive, but when it's bad, it's Jack & Jill. Whether used in comedy or drama or outright horror, there are countless examples of actors delivering terrific performances in more than one role at once, and that's before we even get past Cloud Atlas. Still, we've had a go at totting up 25 of the best.