Even Lobot, the loyal aide to Lando Calrissian on Cloud City, has guest starred in Doctor Who. Hollis played the cyborg assistant to Lando in The Empire Strikes Back, of course, helping to free the rebel heroes after his boss's deal with Darth Vader went sour. For Doctor Who, Hollis played Professor Sondergaard in the 1972 story The Mutants. If that adventure sounds familiar, it's because his co-star, Garrick Hagon, went on to play Biggs Darklighter.