its been a long time but IIRC isn't that basically Ghidorah's classic origin? Didn't aliens or something trick humans into trapping Godzilla, Mothra, and Rodan somehow before letting Ghidorah loose to conquer Earth? Which caused the humans to realize 'we dun goofed' so they freed the three and let them fuck Ghidorah's shit up as a team.
I think I'm mixing multiple movies up now that I'm looking it up
Yeah, but you got the gist of it.
Ghidrah: The Three-Headed Monster had Godzilla, Mothra, and Rodan teaming up against Ghidorah. Godzilla Vs. Monster Zero had Earth lending Godzilla and Rodan over to another planet only to be betrayed when they placed all three monsters under mind control and set them loose on Japan.