Doctor Who's newest star Samuel Anderson makes his debut in a clip from tomorrow night's episode, which is entitled Into the Dalek.
Anderson has been cast as Danny Pink on the BBC sci-fi series - a maths teacher and former soldier who romances the Doctor's assistant, Clara Oswald (Jenna Coleman).
"I was so excited to join Doctor Who - it's a quintessential part of British culture and I can't believe I'm part of it," the actor said earlier this year.
"It's an honour to be able to work alongside Peter Capaldi and Jenna Coleman and I can't wait to show people how my character becomes involved with such a fantastic duo!"
Into the Dalek was written by Doctor Who showrunner Steven Moffat. The episode airs on Saturday (August 30) at 7.30pm on BBC One.