Doppelgänger
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  • Lynn Loring, real-life wife of Roy Thinnes replaced Tisha Sterling, who had to withdraw because of illness.

  • Ed Bishop replaced Peter Dyneley, after rushes revealed the latter's physical similarity to Patrick Wymark, which was thought likely to confuse audiences.

  • The Phoenix spacecraft's power reactor is depicted as having been manufactured by Rolls Royce.

  • Patrick Wymark's character complains of heart trouble early in the film. Ironically, Wymark really did have a bad heart and died the following year.

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