One of the relatively straightforward parts of Doctor Who lore is the linear progression of how the show's main character changes over time. However, even that has become more complicated in recent years. After former showrunner Chris Chibnall introduced a string of Doctors from before William Hartnell's original version from 1963, Russell T Davies then made this even more complex by inventing the concept of bi-generation in 2023's "The Giggle." While recording a commentary for the final episode of Doctor Who's 60th anniversary trilogy, Davies explained what he saw as a hidden quirk of the Doctor splitting in two, and his bizarre theory deepens the mystery even further of what was once a relatively easy timeline to follow.

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