Boomerang Max (MA-9) is one of the Proto-Max Units. He is seen attacking Bomber Zero, but when the Jetters retreated he had to face Silver Bomber, Pretty Bomber, and four other Bombermen. He was later seen keeping Jetters from stopping the arms. He is defeated by Bomber Zero after a failed attack method. He is later summoned by Dr. Mechado to form the Dark Force Bomber. After Dark Force Bomber's downfall, Boomerang Max is destroyed for good.
- Boomerang - He can launch the boomerang attached to his head. It is strong enough to cleave through stones and trees.