Jenna Coleman has quit 'Doctor Who'.

Jenna Coleman

Jenna Coleman

It has been confirmed that the 29-year-old actress - who has played Clara Oswald, the Doctor's companion since 2012 - will depart from the BBC One show at some point during this run of episodes, with the series kicking off tomorrow night (19.09.15).

Showrunner Steven Moffat teased: "Not all of them will get out alive. One of the three intruders must face the raven.

"We're pushing the boundaries once again with the most experimental episode Doctor Who has ever made."

The news is likely to be a shock for fans as Clara is the first companion to have been killed off since the series restarted. The episode following her exit will also be the first time the Doctor has appeared without a companion.

Following her departure from 'Doctor Who', Jenna has signed up for an eight-part drama on ITV where she will play Queen Victoria.

Of her new role, she shared: "I am delighted to be cast as Queen Victoria in this ambitious drama of her life. She is a vivid, strong, inspirational and utterly fascinating woman in British history and I can't wait to tell her story."