The Milwaukee Showdown was a battle that occurred on September 19, 2015.
Battra senses a new threat to the Earth and travels to the city of Milwaukee. As he arrives he sees Rulers of Earth Orga destroying the city, and Battra attacks the beast. As they start to fire beams at each other, the G-Force Operator sends a mecha, but it will take a while to get there. Meanwhile, the battle turns into close combat, with Battra eventually burrowing under the ground.
Battra pops up and stabs Orga with his horn, before sending an energy pulse through it do damage the alien's insides. Orga tries to rip Battra's horn off, but fails. Orga then begins to absorb Battra's DNA, growing a similar horn and tail. Battra then turns into his Celestial form, assaulting Orga with powerful white beams. However, Inferno DesGhidorah appears and attacks, but Battra is still able to hold his own until the mecha, Mecha-King Ghidorah, arrives, turning the battle in his favor. Battra ends up taking a shoulder beam in his soft belly from Orga, though, as he blocks a hit aimed at Mecha-King Ghidorah.
ZSG then arrives to help the two villains, with Battra passing out from his wounds. After a short encounter, MKG breaks free from the GDF's control and joins ZSG. Afterwards, FrankGoji arrives and helps Battra recover.
- Mecha-King Ghidorah is introduced.
- Mecha-King Ghidorah joins ZSG's forces.
- Battra unlocks his Celestial form.