Over Doctor Who’s long history, what prompted the decision to leave for those in the lead role?

All sorts of things have killed off the Doctor.

But there are all sorts of reasons why actors dont stick around and play the part forever.

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And for an actor of Peters stature and brilliance, hes cracked it now.

[…] And now he can go and do another one.

To me, kids are the greatest audience and the greatest critics in the world.

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The Doctors ability to regenerate was invented to solve a practical casting problem.

Final story:The War Games(1969)

In his own words:Three years was long enough.

I didnt want to get typecast, and one had to get out while the going was good.

Season 11 brought a lot of changes toDoctor Who.

Its also the first story to coin the term regeneration.

When I offered my resignation, I was quite astounded by how swiftly it was accepted.

Well, I cant blame them.

I cant blame them.

He remained so until the 1996 TV movie, in which he was invited back to regenerate.

[…] Im very proud of what we did with it.

But when ya gotta go, ya gotta go and Trenzalore calls.

Youre always the Doctor.

Its a good analogy.

The character of the Sixth Doctor has come in for a particularly positive reappraisal in the audio range.

I never did give it up because people wouldnt let me give it up!

the once and future Doctor toldDigital Spy.

And Im still happy!

Quotes taken fromThe Doctor His Lives And Timesby James Goss and Steve Tribe, available from BBC Books.