- Angela Thorne as Carole McAdams
- Mollie Sugden as Janice Howard
- Don Henderson as David Frierson
- Frank Thornton as Dr. Louis Freguson
- Michael Knowles as Night Guard Blyton
- Ballard Berkeley as Detective Berk
- Chris Latta as the voice of Matt
- Ed Gilbert as the voice of Pocketman
- Frank Welker as R.A.O.U.L.
- Peter Cullen as the voice of Creature Weird
- Dick Gautier as the voice of Buster
- Ian Carmichael as Dr. George
- Beryl Reid as Thesea
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