1955

In 1955, the Fourth Doctor visited Professor Chronotis at St Cedd's College, Cambridge. (HOMEVID: Shada)

Alternative timeline
In an alternative timeline in which Nazi Germany won World War II, the Seventh Doctor fled Colditz Castle in October 1944 shortly after his companion Ace was killed by Feldwebel Kurtz. Immediately afterwards in his personal timeline, he returned to Germany during this year. The TARDIS materialised near a border checkpoint in the West. As he appeared to be carrying a weapon, the Nazi soldiers on duty shot him immediately. After examining his body, they realised that it was in actuality an old umbrella. Although the TARDIS was captured, the Doctor's body seemingly disappeared. Absconding after his regeneration into his eighth incarnation, the Doctor adopted the alias "Johann Schmidt." He later told Elizabeth Klein that he was a collector of sorts who had stolen the Doctor's body and gained possession of the TARDIS key. (AUDIO: Klein's Story)