Doctor Who put a game-changing twist on the 57-year-old concept of Regeneration.

Longtime fans ofDoctor Whowill be more than familiar with the Time Lords' death-defying concept of regeneration.

During his final standoff with Neil Patrick Harris' Toymaker on the U.N.I.T.

David Tennant as Doctor Who Bi-generation

Here we go again.

The 15th Doctor explained bi-generation as something that is"supposed to be a myth."

There’s no such thing, bi-generation is supposed to be a myth But… Look at me."

Doctor Who 14th Doctor Regeneration Bi-generation Laser death

It certainly appeared all this trauma and burden was left upon the 14th Doctor to unwind and process.

DONNA: “You don’t have to stay forever.”

DOCTOR: “We’ll see.”

Doctor Who 14th Doctor Regeneration Bi-generation

DONNA: “Do you miss it?

I’ve never been so happy in my life.”

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