British actor, most famous for being Seventies-trapped Woobie Sam Tyler in Life On Mars, a magnificently hammy Master in Doctor Who and Intrepid Reporter Cal McCaffrey in State of Play. Other notable roles include Sexby in the English Civil War drama The Devil's Whore, Raskolnikov in a BBC adaptation of Crime and Punishment, and characters in the films Skellig and 24 Hour Party People (in the latter, playing Joy Division guitarist/New Order lead singer Bernard Sumner).Still, The Mighty Boosh asks "Who the fuck is John Simm?"
- Berserk Button: While he doesn't become outright enraged at it, he does seem to have a strong dislike towards print interviews saying they take things out of context. See Creator Backlash below for a specific example of this.
- He even posted several tweets on his Twitter account about how much interviews that take what he says out of context annoy him.
- Clint Squint: Repeatedly as the Master.
- Creator Backlash: Subverted. While he isn't a very outgoing person and prefers a private lifestyle, he does try to be polite to his fans as much as possible.
- A news article in the Radio Times claimed that he hated Doctor Who fans and wished they would just leave them alone. Mr. Simm later stated that what was said was taken out of context and that he didn't hate the fans.
- Executive Meddling: Apparently Russell T Davies pushed him to play the Master as a "giggling lunatic" and Simm later admitted he felt he couldn't give the required depth to the character. The Master's return in The End of Time shows much more depth while remaining himself.
- Grim Up North: His roles in Life On Mars and (to a lesser extent) Clocking Off.
- Large Ham: Went Ham-to-Ham with David Tennant, and depending on who you ask, he won.
- Manly Tears:
- Mean Character, Nice Actor: As the Master.
- Method Acting: He says there's no such thing as the Method, but since the term is colloquially used to refer to Stanislavskian acting styles, this fits in with his training and his acting style.
- So My Kids Can Watch: It's the reason he was in Doctor Who.
- Irony: After watching his own performance, he thought his own children shouldn't see what he did as The Master due to it being too disturbing.