mechagodzilla_(godzilla:_city_on_the_edge_of_battle)
This Mechagodzilla made its first appearance in the novel, Godzilla: Monster Apocalypse, a prequel novelization to the 2017 film, Godzilla: Planet of the Monsters, which detailed its origins and original fate.
Mechagodzilla then appeared in the 2018 prequel novel, Godzilla: Project Mechagodzilla, where more of its history and abilities were run down.
It made a cameo appearance in Godzilla: Planet of the Monsters and its manga adaptation, where its failed use was briefly detailed. Mechagodzilla went onto have its first major film role in the 2018 film, Godzilla: City on the Edge of Battle, where it was used once more against Godzilla Earth, and eventually destroyed.