The New Mazinger Army is a group made by Necro Jinga to fight the Mazinger Army. The group is composed of androids with robot forms similar to those in the Mazinger Army with similar but often stronger attacks.
At first composed of just Necro and Bui, they started their first fight with Seto and Reito Magami and defeated them. Later as Dark and Shin are encountered, Necro recruits them to fight against the rest of the Mazinger Army. As they enter another fight with the Mazinger Army, Shin and Shiko are accidentally combined into the Majeeg, with both groups teaming up to fight it. Seto becomes the Astro Mazinger and manages to stop the robotic monster with her Photon Ring. Afterwards, both groups stop fighting but still get into some quarrels.