Jenna Coleman is leaving 'Doctor Who'

It is the end of an era for "Doctor Who." Jenna Coleman is leaving the drama after about three years with the popular sci-fi series.

Coleman, who played companion Clara Oswald to both the Matt Smith and Peter Capaldi's Doctor Who, announced her departure during an interview with BBC Radio 1.

"I have left the Tardis - it's happened," she said, following reports earlier this week. "I've filmed my last scenes."

She also posted her departure from the series on Twitter:

Coleman is leaving the series to play Queen Victoria from age 18 to her ascension to the throne for British channel ITV. She's set to begin shooting soon.

"[My exit has] been in the works for a very long time," she said on the radio show. "[Writer] Steven [Moffat] and I sat down a year and a half ago and tried to work out the best place to do it and tell a really good story.

"We're not going to give any details but it will happen at some point this season... We worked out a really good story arc out so hopefully people will love it."

Coleman's final season of "Doctor Who" debuts Saturday, September 19 at 9 p.m. on BBC America.