If you loved Invasion of Astro-Monster, try Terror of Mechagodzilla
A bridge between a film you've already seen and one most people haven't. Here's what they share, and what the second one does that the first one doesn't.
What they share
Both films are directed by Ishirō Honda, and they both carry the playful mood tag, and they sit in Action / Science Fiction territory. If that's the register that drew you to Invasion of Astro-Monster, the second film will land in a comparable space — through a different lens.
playful
What Terror of Mechagodzilla is
You pilot a sub to the ocean floor, scavenging wreckage. But a living dinosaur guards it. Interpol eyes a disgraced scientist, plus his daughter. Her allegiance with aliens resurrects a weapon. Honda's last Godzilla film balances camp with genuine pathos. It lingers in the mind.

