Fearless Fly battles the Martians.
Bob McFadden
Milton the Monster (voice)
Dayton Allen
Fearless Fly / Professor Weirdo / Heebie / Jeebie (voice)
Herb Duncan
Count Kook / Muggy Doo / Two Feathers (voice)
Beverly Arnold
Penny Penguin / Flora Fly (voice) (uncredited)
