Peacong was a Bird Type Warrior Beast who saw action along with SuperHuman Gironian, on Ep.13 of the Great Mazinger Anime. His body was Blue and Gray in color tunes, with four Brown legs and Feathers which were colored Pink, Blue and Dark Green. It had a long neck, with Brown and light Green, a black head with gray curved horns and a purple crest that ran all the way through the back of the neck. Peacong had rocket boosters located on the back (literally it's ass), which help him to fly, he carried a missile launcher on the back and could use his feathers as shields, as well, he could fire an electromagnetic lighting that screws with the systems of other Robots. Peacong's true Human face was located on the Beast's forehead. Peacong is one of the few Beasts not to be destroy by Great, but finished off by Venus A.

Peacong (along with Gironian) were taken under the command of the Great General of Darkness in the first instance the General is force to go out on a mission after the various failures from his Generals and the Intelligence Army. Peacong is launched from the Mikelos and attacks the nearby city. Tetsuya is informed and launched Great Mazinger to fight it, as the two fought, Peacong uses his feathers for Protection from the Great Boomerang and Great Burner, when Great Mazinger is taken down by the SuperHuman Beast Gironian, who catches him in pool of molted tar as Peacong uses his Electromagnetic ability to destabilize Great's Systems.

Realizing the situation Venus A is launched, with the lab unprotected, the General takes the chance to proceed with the next face of the plan, attack the lab itself with the Mikelos, which dashes straight to the lab's shield and destroys it. The Lab goes into its mobile stage and makes a stand off against the flying fortress. Meanwhile, Venus A arrives and fires multiple rockets on a distracted Peacong, destroying its feathers and thus the Electromagnetic Rays, freeing Great Mazinger on time. An enraged Peacong tries to attack Venus A but Jun disposes of the Beast with optic Beams.