| Cast | Jon Pertwee (as The Doctor), Katy Manning (as Jo Grant), Nicholas Courtney (as Brigadier Lethbridge-Stewart), Richard Franklin (2) (as Captain Mike Yates), John Levene (as Sergeant Benton), Stewart Bevan (as Professor Clifford Jones), Jerome Willis (as Stevens), Mitzi McKenzie (as Nancy), Ben Howard (as Hinks), John Rolfe (as Fell), Tony Adams (as Elgin), Roy Skelton (as James), Richard Beale (as Minister of Ecology), Talfryn Thomas (as Dave), Roy Evans (as Bert), Mostyn Evans (as Dai Evans), John Scott Martin (as Hughes), Ray Handy (as Milkman), Terry Walsh (as Guard), Brian Justice (as Guard), Jean Burgess (as Cleaner) |
