Regeneration (Doctor Who) - Wikipedia

Where does the war doctor fit into the timeline? It would make sense if it was after the film as the regeneration is shown and there is a sonic unlike the 1st

Journey's End (Doctor Who) - Wikipedia

How Does Doctor Who Regeneration Work?

Doctor Who's regeneration explained by TorinZece on DeviantArt

List of causes of regeneration, Tardis

Twelfth Doctor - Wikipedia

First Doctor - Wikipedia

Why Doctor Who Can Cross Time and Space But Can Never Be a Woman

Doctor Who (series 5) - Wikipedia

Doctor Who (season 19) - Wikipedia