The Five Beastnoids (recurring monsters of the week):
Psygorn the psychic
Messerbeast the flyer
Aquaiger the underwater warrior
Metzler the spy
Beastking, Monster's underling
Metzler and Aquaiger die in mid-series while the others are powered up.
Mecha Gigans and Neo Mecha Gigans Giant are the robots of the week.