The Quatermass Experiment

Mark Gatiss is an English actor, comedian, screenwriter and novelist. He is known as a member of the comedy team The League of Gentlemen alongside Reece Shearsmith, Steve Pemberton and co-writer Jeremy Dyson, and has both written for and acted in the TV series Doctor Who and Sherlock, the latter of which he also co-created.

Credits include: Exodus: Gods and Kings, Basic Instinct 2, Obi-Wan Kenobi, Rome and Luther

David Tennant was born David John McDonald in Scotland, to a father who was a Presbyterian minister. Brought up in Bathgate, he attended Paisley Grammar school and was first noticed by Scottish television at a Saturday youth club he attended. He trained at the Royal Scottish Academy of Music and Drama. In 2005, David was cast to play the role of the Doctor in the BBC's new series of "Doctor Who" alongside Billie Piper, after Christopher Eccleston decided to leave.

Credits include: The Crying Game, My Left Foot, Line of Duty, The General and Good Vibrations

Credits include: The Social Network, The Curious Case of Benjamin Button, Lock, Stock and Two Smoking Barrels, Kick-Ass and The League of Extraordinary Gentlemen

Andrew Scott is an Irish film, television, and stage actor. He received the 2005 Laurence Olivier Award for Outstanding Achievement for A Girl in a Car with a Man, and an IFTA award for the film Dead Bodies. Scott's notable television roles have included Paul McCartney in the BBC television drama Lennon Naked and arch-villain Jim Moriarty in Sherlock, for which he was awarded the 2012 British Academy Television Award for Best Supporting Actor.

Credits include: 300, 300: Rise of an Empire, Playing God, Edward II and The Bunker

Credits include: A Touch of Cloth, Teachers, Dirty Filthy Love, The Quatermass Experiment and Hard Boiled Sweets