10 Important Doctor Who Questions NOBODY Can Answer

10. Can Time Lords Regenerate Into Animals Or Aliens?

To be honest, regeneration could take up all ten entries in this list. How does it sometimes change the Doctor's clothes? How can the Doctor and Romana choose their future faces?

But most pressingly of all, can Time Lords only regenerate into British character actors?

Generally? Yes. That's mainly what we see, after all. But there are some hints throughout Doctor Who history that suggest otherwise. For example, just before regeneration, the Ninth Doctor speculated that his next incarnation could grow another head. The Eleventh Doctor also checked to see if he had a full set of human anatomy in The End of Time.

And then, of course, there's Destiny of the Daleks, in which Romana regenerates into a small blue alien and an eight-foot-tall goddess. Meanwhile, other media – like the lockdown webcast The Secret of Novice Hame – has even suggested that the Doctor can become an animal.

So while it may be possible, we'll probably never get a definitive answer on whether the Doctor can be an animal or an alien, and you know what, that's for the best.

As fans we freak out when the sonic screwdriver gets an update, so god knows how we'd handle Dog-tor Who.