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Creator Backlash: John Christopher was pleased with the first season of the TV series, but felt that the second season drifted too far from his original vision by its end.
The TV series was notable for being one of the first television series to avoid the use of Rubber-Forehead Aliens. The Masters were animatronic puppets that had roughly triangular bodies,with one limb supporting the torso/head segment and two other limbs extending from a shoulder-like area, one one limb each side of the central torso-limb.
This is a change from the books, where they were more upright, with three legs, three tentacles and three eyes,plus a nasal-oral area, on a heavy body that was a roughly triangular torso and head with no real neck.