Geoffrey Beevers, sometimes credited as Geoffery Beevers, played the Master in The Keeper of Traken. He has also appeared in the Big Finish Productions audio dramas Dust Breeding and Master. He is married to Caroline John who was also in Doctor Who as the third Doctor's companion Liz Shaw. Beevers appeared with Caroline in the Liz Shaw spin-off videos The Devil of Winterborne and Unnatural Selection. Prior to that, he appeared with her in one of the Stranger videos, Eye of the Beholder. Caroline also appeared in Dust Breeding as Madame Salvadori.