Ncuti Gatwa's shock regeneration is followed by an even bigger surprise as the show welcomes back a popular star of TARDIS past. BEWARE! Spoilers ahead!

And so regeneration became part of the fabric of Doctor Who. Generations watched as The Doctor changed physically, while essentially remaining the same person.

20 years since 'Doctor Who' had to change faces one more, the Ninth Doctor's final moments remain one of the show's best examples of a Doctor's goodbye.

Doctor Who 's decision to make the 13th Doctor regenerate into a female body prompted the predictable degree of controversy, but it's not the first time the BBC series has come under fire. The ...

Doctor Who showrunner Steven Moffat has acknowledged The Doctor's regeneration limit. Speaking at the Ad-Lib event at the Edinburgh Fringe Festival, Moffat gave little detail about how he plans to ...

Doctor Who’s enduring success can largely be attributed to regeneration: a conceit whereby the central character is able to change their face, and thus cheat death.

How regeneration has helped make Doctor Who a worldwide TV phenomenon that has thrilled for 50 years ( Image: BBC) opinion ...

How do any real world human experiences relate to how the lead character in BBC's "Doctor Who" series undergoes personality change upon regeneration? Is science fiction relevant?

Doctor Who broke the regeneration rules in the 60th anniversary specials but pretty much every regeneration has broken the rules somehow.

Related: Doctor Who ’s Jodie Whittaker teases “stripped-back” regeneration scene The regeneration then took full effect and David Tennant ’s 10th incarnation of the Doctor emerged.