The events of Ghidrah the Three-Headed Monster happen just as they did in the film, but with one exception (or would it be two?):
Instead of Rodan emerging from Mt. Aso, Anguirus rises from Osaka Bay. Kong replaces Godzilla, smashing the ship with his bare hands and eventually encountering Anguirus.
How does their one-on-one battle go? Can Mothra convince them to join forces? And how would this trio do against King Ghidorah?