Produced in 1967, Gamera vs. Gyaos is one of the more popular entries in the Showa Gamera series, and it would introduce Gamera's most popular foe, Gyaos. The film was also the last entry to feature a music score by Tadashi Yamauchi, who also scored the first film as well. This film featured the return of Gamera's love of children, and it was the movie where Gamera became a heroic monster instead of a villain, like he was in the previous two entries. Like the first movie, and all succeeding it except Gamera vs. Barugon, Gamera vs. Gyaos was directed by Noriaki Yuasa, who also helmed the special effects.
Often considered the last really good film of the Showa Gamera series (though Gamera vs. Jiger is another contender), Gamera vs. Gyaos, like Invasion of Astro-Monster, was also the beginning of the end for the franchise, as Gamera's love of children would only cause future films, with the possible exception of aforementioned Gamera vs. Jiger, to become increasingly ridiculous and child-oriented. Oddly enough, the films would still be very gory, with monsters bleeding and losing limbs like a carnival of delicious horrors.
This movie contains examples of the following tropes:
- Adults Are Useless: Not all of them, but the vast majority, especially that reporter.
- Asshole Victim: Okabe, who leaves Eiichi behind in a crumbling cave and gets eaten by Gyaos.
- Awesome, but Impractical: Gyaos's forked throat allows him to produce sonic beams. Unfortunately for him, this also means that he is physically incapable of turning his head, just as in every live-action Batman film from 1989 to 2005.
- Breakout Character: Gyaos. Similar to Godzilla and King Ghidorah, Gyaos would become Gamera's Arch-Enemy, having major roles as the villain in several films throughout the franchise and in the video game.
- Breath Weapon: Gamera has his flame-thrower, and Gyaos has his sonic beam, which is due to him having a forked throat, causing him to be unable to turn his head.
- Comic Relief: Occasionally done by two workers who work alongside human lead Shiro Tsutsumi.
- Family-Unfriendly Violence: Gyaos nearly slices Gamera's right arm off in their first battle; both monsters, Gamera especially, bleed profusely in each encounter; Gyaos slices his own toe off in the second battle; Gyaos eats people on screen, and Eiichi throws his toys at some angry villagers.
- Friend to All Children: Gamera, and here is where it became really pronounced.
- Giant Flyer: Gamera and Gyaos.
- Healing Factor: After chopping off his own toe to escape Gamera, Gyaos is seen recuperating in his cave and growing a new toe. Stupidly, he breaks off a stalactite with his beak and drops it on the still-sensitive toe.
- Make Me Wanna Shout: Gyaos uses super-sonic beams produced by a special forked throat.
- Our Vampires Are Different: For one, this vampire can shoot sonic beams out of his mouth, and he definitely does not sparkle in the light, although his head does glow red. And oh yes, he's a 200-foot-tall silver pterodactyl.
- Ptero Soarer: Gyaos fills out pretty much every cliche in the book regarding fictional portrayals of pterosaurs.
- Red Herring: It would seem like Gyaos' inability to turn his head was implying that Gamera would slay him by breaking his neck. Even the sunlight weakness is another reverse Chekhov's Gun, since Gamera kills Gyaos by dumping him into a volcano.
- Spell My Name with an "S": Gyaos's name has been spelled "Gyaos" and "Gaos", and no official source has really chosen one over the other. At least one DVD even calls him Gaos.
- Both have been official. When Daiei created the character in 1967, "Gaos" was the official English spelling. The new Daiei decided to change the name to "Gyaos" for the 1995 film and that seems to be the official English spelling ever since. But from 1967-1995, the name was officially "Gaos."
- To Serve Man: Gyaos' primary food is PEOPLE!, although he also eats some cattle (off screen) as evidenced by one distraught farmer's grieving.
- Weakened by the Light: Sunlight and ultraviolet light are harmful to Gyaos, and it causes his flesh to literally shrink.