Sometime Never... is a BBC Books original novel written by Justin Richards and based on the long-running British science fiction television series Doctor Who.

The epilogue of the novel offers a possible explanation to the fan asked question of how the Doctor can still exist after the destruction of Gallifrey in The Ancestor Cell.

The Jonah arrives, disguised as a Police Box in 1963, with Octan's Starkiller (replacing the Hand of Omega).

This potentially retcons the entire series, giving an alternative explanation to the Doctor's origins without the Time Lords.

However, the cataclysm set up an event horizon in time that prevented anyone from entering Gallifrey's relative past or travelling from it to the present or future.