cast
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Anthony Eustrel
Harry Domain
- Eugene Leahy Dr. Gall
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Derek Tansley
Dr. Hellman
- Maurice Bannister Jacob Berman
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John Stuart
Alquist
- Evelyn Moore Emma
- Joy Adamson Sulla, a robotess
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Patrick Troughton
Radius, a robot
- Dermot Palmer Primus, a robot
- Viola Merrett Helena, a robotess
- John Baker Marius, a robot
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Pamela Stirling
Helena Glory
- David Scase A Robot