Son of Godzilla:
Another first time watch for me, and goofier than Ebirah. Multiple fights against no-name kaiju-ized mantises and spiders are notable in that Godzilla has no need to preserve them for future sequels.
Sadly, Minilla will return.
Destroy All Monsters
Even Minilla can't ruin this all-star brawl that carries one of the best human-scale subplots in the series. The best 60s Godzilla film.
All Monsters Attack
Minilla's front and center in this most Gamera-adjacent of Godzilla films. Maybe the least essential in the series.
@horacemajeur in my youth watching All Monsters Attack, I was confounded by the name of the kaiju who attacks Minilla in Ichiro's dreams: Gabara. It seemed to me to be pronounced as Gamera. I thought that was odd and when I mentioned to multiple friends that there were two Gameras they branded me as crazy. Nobody remembered the electrified "Gamera", only the turtle! Then the Internet came along...
@hallmarc Strangely, despite being aware of kaiju from a tender age, I never saw any Gamera until mst3k. I would've liked those even more than Godzilla, I expect.