If you loved Gamera vs. Guiron, try Gamera: Super Monster
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 Noriaki Yuasa, and they both carry the playful mood tag, and they sit in Action / Family / Science Fiction territory. If that's the register that drew you to Gamera vs. Guiron, the second film will land in a comparable space — through a different lens.
What Gamera: Super Monster is
A giant space barge full of bad vibes cruises toward Earth while three sequined cosmic babes cosplay as Earth’s last best friends to a kid who chats with turtles the size of oil tanks. The turtle, currently unsupervised, must size up against every Monday-morning villain the toy aisle ever dreamt up. The finale checks every box except realism.

