Peter Davison Doctor Who Actor Janet Fielding Tegan Jovanka Actor Nicola Bryant Peri Brown Actor Mark Strickson Vislor Turlough Actor Gerald Flood Kamelion Actor Anthony Ainley The Master Actor David Neal The President Actor Ian McCulloch Nilson Actor Dallas Adams Howard Actor William Lucas Range Actor Nigel Humphreys Bulic Actor Martin Cochrane Chellak Actor Andrew Conrad Remus Actor Peter Wyngarde Timanov Actor James Coombes Paroli Actor Raymond Murtagh Retrograde Actor Norman Comer Icthar Actor Helen Blatch Fabian Actor Jonathan Caplan Roskal Actor Barbara Kinghorn Timmin Actor Peter Moffatt Director Ron Jones Director Pennant Roberts Director Fiona Cumming Director Graeme Harper Director Matthew Robinson Director Michael Owen Morris Director Johnny Byrne Writer Anthony Steven Writer Christopher H. Bidmead Writer Robert Holmes Writer Peter Grimwade Writer Eric Pringle Writer Eric Saward Writer John Nathan-Turner Producer