Godzilla vs. Gigan
Film · March 12, 1972 · Toho

Picture: Film studio / Not freely licensed — film poster, your fair use call
Alien cockroaches running a theme park send Gigan and Ghidorah against Godzilla and Anguirus. Directed by Jun Fukuda.
Sources
- Entertainment Weekly · How to watch all 36 live-action Godzilla movies in order (Nov 6, 2026)
- Wikipedia · Godzilla vs. Gigan