Mechagodzilla has a new origin story and different abilities with each new film incarnation. These are:
A giant battle robot modeled on the image of Godzilla and built by the aliens of Black Hole Planet 3 as part of their plot to conquer Earth.
The ultimate war machine built by the United Nations Godzilla Countermeasures Center using reverse-engineered 23rd century technology salvaged from the ocean floor after Godzilla defeated Mecha-King Ghidorah and the Futurians.
An anti-Godzilla weapon created using DNA from the bones of the original Godzilla.
All the Mechagodzillas are created in the hope of being the ultimate weapon to use against Godzilla. With every part of its body functioning as a weapon, Mechagodzilla always poses a real threat.

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