My greatest memory of him was D!sney's
TRON, as you may have guessed, but he can also be connected to the Trek realm (
The Undiscovered Country) and to Dr Who (the 2013 Matt Smith story "Cold War", and playing the Doctor himself in an alternate-universe timeline, among other things, while with Big Finish)... other collabs include as Fielding in the Beeb's 2006 rendering of
Sweeney Todd... Sunday in London; 80.
B