Follows on from "Doctor Who: Dark Legends", which follows the same variation of the character and ran from 2018 to 2019. Originally "Reign of the Golden Age" was supposed to be a direct Series 3, but this was changed to allow for a series reboot which could make it easier to understand for newcomers.
This series was brought to fruition to celebrate Doctor Who's 60th Anniversary.
The Doctor seen in this series has the ability to shift realities while travelling in his TARDIS. As a result, he has appeared in the Triesverse series as well as the Curator Chronicles trilogy.