Peter Capaldi, the Scottish actor who is currently playing the role of the Doctor in BBC's longest-running Sci-Fi series "Doctor Who," has explained the reason why he is leaving the series after Season 10.

Capaldi, on his recent guest appearance in "The Graham Norton Show," said that the reason boils down to the show being a "television factory." Which is why he has come to the decision to leave the series after "Doctor Who" Season 10. He did, however, expressed that "Doctor Who" is a "great job."

"You do twelve episodes a year, and I just worried that I wouldn't be able to continue to do my best work," the Scottish actor explained. "I like to be able to learn the lines and do some preparation and come in and give it some vigor and not hate it. I just figure, while you're enjoying it, leave."

Capaldi first broke the news during his guesting at BBC Radio Monday while speaking with show host Jo Whiley in early January, Vanity Fair reported. He confirmed that he will officially park the TARDIS (Time and Relative Dimension in Space) for good after "Doctor Who" Season 10.

Elsewhere on the interview, Capaldi has confirmed that the filming for the Doctor's death - or regeneration rather - has already finished. But he did not reveal any specific details about how it will actually happen.

However, on his past interview, the Scottish actor teased that fans should expect to see the Doctor go through a different kind of regeneration in "Doctor Who" Season 10. He mentioned that the Galifreyan's regeneration in the upcoming season is complicated compared to his previous transformation. And just like his interview on "The Graham Norton Show," Capaldi did not disclose any specifics.

No official word yet coming from BBC on who will replace Capaldi as the next Doctor in the show. More news about "Doctor Who" should surface in the coming months.

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