The Mazinger Army in the so-called Mazinger World is a squad of robots under the employment of the Photon Power Laboratory composing of Lori & Loru with their Million, Shun Azuma with his Baion, Masao Oide with his Daion, and Sayaka Yumi with her Aphrodite A. With the revelation of Koji with his Mazinger Z, they mainly act as back-up units.
We first see the Mazinger Army battle the Mechanical Beasts in the first arc with Koji still getting used to Mazinger Z. When Koji got the Z they work together to stop the Mechanical Beast invasion. However when Juzo dies from an injury caused by Baron Ashura's troops, Koji tries to kill Ashura only to be held back by the Mazinger Army hoping to capture him. But that fails and so Koji and the Mazinger Army go on bad ends.

Mazingers

Photon Atomic Energy (Photonic Energy for short) is a fictional energy source that is the main power source for the Mazinger Z and other related robots.
Super Alloy Z (超合金Z Chogokin Zetto) is the metal alloy used in the construction of the main mecha of the Photon Power Laboratory, the first of which being the Mazinger Z.

Mazinger Z	Great Mazinger	Mazinkaiser

Pilot: Koji Kabuto	Pilot: Tetsuya Tsurugi	Pilot: Koji Kabuto

Angels

The Mazinger Angels (abbreviated as MA) are a secret special forces team of female giant robot pilots. While it is unknown when they were founded, they have always appeared whenever trouble has. There are several branches around the world, including Japan and America. How and where 'Mazinger' comes from is unknown, as the giant robot is nowhere to be seen in the series, nor have their been references to the Angels being referred to as having power of gods or devils.

Aphrodite A	Venus A	Artemis A	Diana A

Pilot: Sayaka Yumi	Pilot: Sayaka Yumi	Pilot: Sayaka Yumi	Pilot: Hikaru Makiba

Venus Ace	Minerva X	Fire Venus	Cutie Honey

Pilot: Jun Hono	Pilot: Maria Fleed	Pilot: Sakurako Hono	Pilot: Honey Kisaragi

Iron Z	Goddess Mazinger

Pilot: Kikunosuke Abashiri	Pilot: Alia Mu

Mazinger Army

The Mazinger Army in Mazinger Edition Z! is a squad of robots under the employment of the Photon Power Laboratory composing of Lori & Loru with their Million, Shun Azuma with his Baion, Masao Oide with his Daion, and Sayaka Yumi with her Aphrodite A.

Million @1	Baion Beta 2	Daion Gamma 3	Boss Borot

Pilot: Lori & Loru	Pilot: Shun Azuma	Pilot: Masao Oide	Pilot: Boss Pilot: Nuke Pilot: Mucha

Space Science Lab

Created as the secret weapon of Planet Fleed, and kept hidden by it's royal family; It's tremendous power was coveted by the Vegan Empire, who attempted to steal it for their own evil ends after destroying the rest of the planet.
In the planet's darkest hours, the robot, equipped with only a single Spazer, was sent to Earth along with its pilot to keep it out of the reaches of evil. It is the only giant robot in the show allied with the protagonists compared to other series in the Mazinger franchise. Due to numerous similarities in power, techniques, and overall aesthetic composition, the Grendizer can be seen as Planet Fleed's intergalactic counterpart to the Mazinger robots of Earth.