Muldwych

Muldwych spent 1,000 years stranded on Mount Kukoeuk on Ant'ykhon. He assisted Bernice Summerfield and Ace with the TARDIS. (NA: Birthright)

He gives Seventh Doctor time rings (for Bernice Summerfield and Jason Kane's wedding). There is some suggestion that he is a future or alternate incarnation of the Doctor. (NA: Happy Endings)