Doctor Who Takes Regeneration to a Whole New Level in The Giggle tor.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from tor.com Daily Mail and Mail on Sunday newspapers.
The American actor, 50, made his debut on the smash hit sci-fi show in the third and final 60th anniversary special, starring David Tennant and Catherine Tate.
The Sex Education actor, 31, finally made his first appearance on screen as the 15th Doctor as David Tennant s incarnation of the character regenerated.