Bob Sessions
Nick's Father / Meanest Monster in Monster Land / Mr. Bad / Gomora / Lobster Men / Geronimon / Dorobon (voice)
Nicholas Curror
Nick
Sarah Taunton
Nick's Mother
Wendy Danvers
Edmund's Wife / Nick (voice) / Ultra Mother (voice)
Marc Smith
Various Ultras / Hanuman (voice) (uncredited)
กาญจน์ บุญชู
Bandit (uncredited)
?
ปรีดา สมทบสุข
Bandit (uncredited)
?
Jan Wanpen
Bandit (uncredited)