Edward Travers (Inferno Earth)
From Tardis Wiki, the free Doctor Who reference
On Inferno Earth, Edward Travers was believed dead by 1959, as told by John Mackay he was killed during an avalanche in Tibet in 1935. (PROSE: The Schizoid Earth)
However, by 1969, it was revealed that he was alive and secretly worked at The Vault, and showed Alastair Lethbridge-Stewart evidence of a conspiracy to take down the Republic of Great Britain. (PROSE: I, Alastair)