- Terry Becker
- Chief Francis Sharkey in "Voyage to the Bottom of the Sea"
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- Sandra Giles
- Dr. Greta Gault in "The Clones" (Giants) and Harem Dancer in "The Marionettes" (Giants)
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- Allan Hunt
- Stu Riley in "Voyage to the Bottom of the Sea"
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- Deanna Lund
- Valerie Scott in "Land of the Giants"
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- Vitina Marcus
- Athena in "Wild Adventure" and "The Girl from the Green Dimension"
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- Don Marshall
- Dan Erickson in "Land of the Giants"
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- Don Matheson
- Mark Wilson in "Land of the Giants", Retho in "The Sky is Falling and IDAK in "Revolt of the Androids"
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- Sheila "Allen" Mathews
- Ruth Templeton in "Return from Outer Space", Brynhilda in "The Space Viking", Aunt Gamma in Princess of Space"
and Mrs. Irwin Allen
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- Lee Meriwether
- Dr. Ann McGregor in "The Time Tunnel"
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- Del Monroe with his lovely wife Linda
- Kowalski in "Voyage to the Bottom of the Sea"
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- Robert Pine
- Craig in "Visit to a Hostile Planet"
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- Warren Stevens
- Forester in "The Saboteur" (Voyage), Lt. Cmdr. Peter Van Wyck in "Cave of the Dead" (Voyage), Sam Garrity in Deadly Invasion" (Voyage), and Harlow in "One Way to the Moon" (Tunnel)
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- Lou Wagner
- J-5 in "The Haunted Lighthouse"
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- Francine York
- Niolani in "The Colonists"
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