https://www.youtube.com/watch?v=s7d63p4V2Ek
One year after the release of the 50th anniversary special, “Day of the Doctor”, the prequel hit the internet and landed on YouTube. It’s featuring the near-meeting of the first and eleventh Doctors in Totter’s lane and the beginning of a long-planned, but forgotten plot to save Gallifrey. This mini-episode is intended to clear up some of the continuity issues with Day of the Doctor, such as the issue of all of the incarnations of the Doctor apparently knowing about the Time War and how the calculations were set running in the first place!