Struggling manga artist Gengo (Hiroshi Ishikawa) whose children's stories involving homework and stern mother monsters are consistently rejected by editors takes a job with the company designing the new monster theme park World Children's Land. When Gengo finds an audio tape dropped by a young woman named Machiko (Tomoko Umeda), he stumbles into a conspiracy that suggests World Children's Land may be a front for more insidious purposes involving the monsters of Monster Island.
After the divisive reception to Godzilla vs. Hedorah (it's hard to know how well it did financially due to scarcity of sources on that point) producer Tomoyuki Tanaka sought to bring the Godzilla series back where he felt it needed to be. With Godzilla still seen very much as cheap kiddie fare at the time, Tanaka devised a premise he felt would entice people back while also being cost effective by brining back fan favorite King Ghidorah who would fight Godzilla along a new monster. Supposedly made for $1.2 million the film was allegedly better attended than Godzilla vs. Hedorah and made $20 million when factoring in foreign exports. Godzilla vs. Gigan is less ambitious than its predecessor and is visibly fighting against its kiddified status and budget, but assuming you can forgive the slow buildup and indulgence of stock footage it can be reasonably entertaining.
As with the previous few Godzilla movies, the human characters are more here out of obligation than for providing anything interesting and while there aren't any prominent child characters here that same feeling of childishness that many later Showa entries have seen is here in spirit. Gengo's bumbling and stupidly on the nose monster drawings based on "what kids hate" to an absurdly literal degree isn't as charming as it thinks it is, and the supporting cast aren't much more developed aside from being "hippie-ish" archetypes who are very Scooby-Doo like in their presence here. Given producer Tomoyuki Tanaka's hatred for Godzilla vs. Hedorah it's rather ironic that he not only recycles footage from that film, but also parts of the message as it is somewhat glanced over when the big "reveal" comes which is disguised with the subtlety of Snidely Whiplash or Dick Dastardly.
So how is the monster action at least? Half-good and half-assed. Starting off with the half-assed portion: the series continues its gratuitous use of stock footage with action scenes for Ghidorah lifted wholesale from Destroy All Monsters and Ghidorah, The Three-Headed Monster most prominently, and the movie does little to disguise it aside from cheaply applying a day-for night filter on it. It's pretty clear that the Ghidorah effects they have now aren't as mobile and dynamic as the early ones with the presence of older footage next to new footage exacerbating that point. With that said the climactic fight in World Children's Land that features Godzilla and Angilus/Angirus vs. Ghidorah and Gigan is pretty fun with Gigan a pretty visually interesting monster that looks like a mixture of a Cylon from Battlestar Galactica, praying mantis, and bird of prey and the fights have some pretty bloody impact scenes at points.
Godzilla vs. Gigan doesn't reach the Showa era's heyday but it doesn't exactly embarrass itself either (questionably suit quality at this point notwithstanding). Godzilla vs. Gigan is a comfortably middle of the road entry that while it has its annoying bits mostly gets those out of the way early enough that the ending is a pretty good time.
