You know how sometimes an idea gets stuck in your head when you hear it?

I just want to see Godzilla wearing a Dino Riders style harness with missile launchers etc.

Crossover through the rift.

The mechs are overwhelmed by alien kaiju led by King Ghidorah, their general. Godzilla and King Kong come to the mechs’ rescue as calvary/heavy artillery, while Mothra and Rodan provide air support.