This is a shortened version of the 1945 Republic serial "The Purple Monster Strikes," which was released to television in 1966.
| Actor | Role |
|---|---|
 Roy BarcroftThe Purple Monster | The Purple Monster |
 James CravenDr. Cygnus Layton | Dr. Cygnus Layton |
 Dennis MooreCraig Foster | Craig Foster |
 Linda StirlingSheila Layton | Sheila Layton |
 Bud GearyHodge Garrett | Hodge Garrett |
| JJoe WhiteheadStewart | Stewart |
| FFred HowardProf. Crandal | Prof. Crandal |
| RRosemonde JamesHelen | Helen |
| MMary MooreMarcia | Marcia |
 John DavidsonEmperor of Mars | Emperor of Mars |
 Wheaton ChambersProf. Benjamin | Prof. Benjamin |