This 1972 Toho release is more of the same. There's a lot of recycled footage from previous movies and it's once again focused on a younger audience. This features aliens that build a Godzilla-themed park that they use to control the monstrous duo of Ghidorah and Gigan.
The plot is silly but simple and it's secondary to the monster battles, of which there are many. Godzilla pairs with the under-muscled Anguirus to tag team Gigan and Ghidorah. There are a number of firsts in this movie. There's two separate scenes where the blood gushes from a slashed Godzilla and another where Anguirus voluntarily drives his head into the rotating saw-bellied Gigan. Inexplicably, Godzilla and Anguirus communicate by actually talking. It's unsettling to say the least and probably freaked out a lot of younger viewers back in its day. "Godzilla Vs. Gigan" is of course, totally ridiculous. But it's got plenty of what we watch these movies for...the monster match-ups. This is also called "Godzilla On Monster Island!"