10 Major Doctor Who Events That Changed Everything

1. The Timeless Child

What could possibly top The Doctor being granted a new lifecycle, allowing them to continue on for at least another 12 regenerations? How about the idea that the lives of the Time Lord known as 'The Doctor' aren't the only lives that the character may have lived? Regardless of its controversial take on the backstories of The Doctor and Gallifreyan history, it’d be impossible to talk about moments that have changed Doctor Who as we knew it without delving into The Timeless Child revelation in the Series 12's aptly named ‘The Timeless Children’.

Upon journeying to a destroyed Gallifrey and being harnessed into the Time Lord database known as the Matrix, The Master proceeds to show The Doctor as much knowledge as there is about their ambiguous past. We discover that, not only was their first incarnation not the William Hartnell First Doctor as was previously believed, we have no real estimate of how many lives they may have lived - besides a few mysteriously teased faces from previous episodes and the existence of The Ruth Doctor.

To top this all off, The Doctor may not even strictly be a Time Lord themselves, having been believed to have been vomited through a rift from another universe and having their unique regenerative powers extrapolated and implanted into the DNA of early Gallifreyans. Although they are, in essence, the foundations of Time Lord society and eventually become 'The Doctor' that we recognise, there is now a gap in their character history the size of a Star Whale that is left to be explored.