Did you know Bernard Cribbins, who played the Doctor Who companion Wilfred Mott in David Tennant's run ALSO played companion Tom Campbell in the Peter Cushing "Dr. Who" movie Dalek's Invasion Earth 2150 A.D.?
Me neither. But apparently David Tennant did, as you can see him here checking up on his old companion (or, technically, his alter ego's companion) as they faced the Daleks ...
Ain't Photoshop grand?
P.S. Typing the title "Daleks' Invasion Earth 2150 A.D." hurts me. It's grammatically correct, but hanging onto that by its fingernails and is SO clunky. "Dalek Invasion of Earth: 2150", please, or just the original "The Dalek Invasion of Earth" from the TV show.