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Heavy Max (MA-7) is one of the Proto-Max Units. He is seen standing on top of a tree after Birdy was attacked by Proto Max Jr. He fights Shirobon, but when the Jetters retreated, he faced Oyabon. He is later seen along with Jr. to keep Jetters from stopping the arms. He is defeated by Oyabon and Daibon. He is later summoned by MechaDoc to form Dark Force Bomber. After Dark Force Bomber's downfall, Heavy Max is destroyed for good.
- Super Strength - Heavy Max has enhanced strength that can make an earthquake by slamming his fist to the ground.