
The Eighth Doctor
Christopher Ryan - Lord Kiv (Mindwarp) / General Staal (The Sontaran Stratagem/The Poison Sky) and Commander Stark (The Pandorica Opens)
David Troughton - Private Moor (The War Games) / King Peladon (The Curse of Peladon) / Professor Hobbes (Midnight)
Bonus trivia: David, son of Patrick “Second Doctor” Troughton, also played a guard in The Enemy of the World (but it looks like the footage no longer exists). David and Colin “Sixth Doctor” Baker were flatmates for ten years, and Colin was the best man at David’s wedding.
Geoffrey Palmer - Edward Masters (The Silurians) / Administrator (The Mutants) / Hardaker (Voyage of the Damned)
Bonus trivia: Palmer’s son, Charles, directed four episodes of Series 3, and his daughter-in-law (Charles’s wife) is Claire “Madge Arwell” Skinner.