Годзилла және Мегалон: Теңіз асты қаласының қаһары

The film was followed up by the fourteenth film in the Godzilla franchise, Godzilla vs. Mechagodzilla, released on March 21, 1974.

In the first part of 1971 (197X in the Japanese version), the second of a series of underground nuclear tests is conducted, near the Aleutians, sending shockwaves as far as Monster Island in the South Pacific, severely damaging the island paradise and sending Anguirus plummeting into the depths of the Earth, with Godzilla narrowly escaping the fissure into which its friends tumble. For millions of years, Seatopia, an opulent undersea civilization that resides in vast cities reminiscent of those of Ancient Greece and Rome, has existed in relative peace, ruled by Emperor Antonio, but nuclear tests in recent years have severely affected the cities via the earthquakes the tests produced. With the Seatopian capital badly affected by the most recent test, the Seatopians plan to unleash their civilization's beetle styled god, Megalon, to destroy the surface world out of vengeance. On the surface, an inventor named Goro Ibuki, his little brother Rokuro, and Goro's friend Hiroshi Jinkawa are off on an outing near a lake when Seatopia makes itself known to the Earth by drying up the lake the trio was relaxing nearby and using it as a base of operation. As they return home they are ambushed by agents of Seatopia who are trying to steal Jet Jaguar, a humanoid robot under construction by the trio of inventors. However the agents' first attempt is botched and they are forced to flee to safety. Some time later, Jet Jaguar is completed but the trio of inventors are knocked unconscious by the returning Seatopian agents. The agents' plan is to use Jet Jaguar to guide and direct Megalon to destroy whatever city Seatopia commands him to do. Goro and Rokuro are sent to be killed, while Hiroshi is taken hostage. Megalon is finally released to the surface while Jet Jaguar is put under the control of the Seatopians and is used to guide Megalon to attack Tokyo with the Japan Self Defense Forces failing to defeat the monster. Eventually, the trio of heroes manage to escape their situation with the Seatopians and reunite to devise a plan to send Jet Jaguar to get Godzilla's help using Jet Jaguar's secondary control system. After uniting with Japan's Defense Force, Goro manages to regain control of Jet Jaguar and sends the robot to Monster Island to bring Godzilla to fight Megalon. Without a guide to control its actions, Megalon flails around relentlessly and aimlessly fighting with the Defense Force and destroying the outskirts of Tokyo. The Seatopians learn of Jet Jaguar's turn and thus send out a distress call to their allies, the Space Hunter Nebula M aliens (from the previous film) to send the alien monster Gigan to assist their allies. As Godzilla journeys to fight Megalon, Jet Jaguar starts acting on its own and ignoring commands to the surprise of its inventors and grows to gigantic proportions to face Megalon itself until Godzilla arrives. The battle is roughly at a standstill until Gigan arrives and both Megalon and Gigan double team against Jet Jaguar. Godzilla finally arrives to assist Jet Jaguar and the odds become even. After a long and brutal fight, Gigan and Megalon both retreat and Godzilla and Jet Jaguar shake hands on a job well done. Jet Jaguar bids Godzilla farewell and Godzilla returns to its home on Monster Island. Jet Jaguar returns back to human size and returns home with Goro and Rokuro.

The origins of Megalon can be traced back to 1969's All Monsters Attack, as the original working idea for the film's antagonist Gabara was initially envisioned as a giant mole cricket called Gebara. The character was later reworked into Kaoru Mabuchi's 1971 treatment for Godzilla vs. the Space Monsters: Earth Defense Directive, a precursor to 1972's Godzilla vs. Gigan. The proposal called for Megalon to be paired with Gigan and King Ghidorah under the command of the hostile alien invader Miko, only to be defeated and driven off by the combined might of Godzilla, Anguirus, and a brand new monster called Majin Tuol. The next draft of the script, titled The Return of King Ghidorah!, retained the core villain cast of Gigan, King Ghidorah, and Megalon, but replaced Anguirus and Majin Tuol with Varan and Rodan. However, most of the proposed monsters were cut, leading to the final version of Godzilla vs. Gigan. Contrary to popular belief, there is no evidence Godzilla vs. Megalon was originally planned as a Jet Jaguar solo film, and no Japanese sources have surfaced which claim otherwise. Rather, the creation of Jet Jaguar was the result of a contest Toho had for children in mid to late 1972. The winner of the contest was an elementary school student, who submitted the drawing of a robot called Red Arone. Red Arone was turned into a monster suit, but when the child was shown the suit, he became upset because the suit did not resemble his original design. The boy's original design was white but the costume was colored red, blue and yellow. Red Arone was used for publicity, but Toho had renamed the character Jet Jaguar and had special effects director Teruyoshi Nakano redesign the character, only keeping the colors from the Red Arone suit. The Red Arone suit had a different head and wings. According to Teruyoshi Nakano, Godzilla vs. Megalon was a replacement project for another film that was cancelled at the last minute,

The film had three early treatments, each written by Shinichi Sekizawa, one was titled Godzilla vs. The Megalon Brothers: The Undersea Kingdom's Annihilation Strategy which was completed in September 1972. The second was titled Insect Monster Megalon vs. Godzilla: Undersea Kingdom's Annihilation Strategy, which was turned in on September 5, 1972, and the third draft was submitted on September 7, 1972. In 1998 the film was again released by UK company, 4 Front Video. As of now it appears those are the only two VHS tapes on the film that are unedited and in high quality. It was also released on DVD by Power Multimedia in 1999 in Taiwan. Originally the Sci Fi Channel (now SyFy) showed the cut version, until finally in 2002 as Toho regained ownership of that title alongside Godzilla vs. Gigan and Godzilla vs. Mechagodzilla (both of which also were released by Cinema Shares) and broadcast the film fully uncut for the first time in the U. S.

In Japan, Godzilla vs. Megalon sold approximately 980,000 tickets. It was the first Godzilla film to sell less than one million admissions. It earned ¥220 million in Japan distribution income (rentals). The film was a success in American theaters, earning $383,744 in its first three days in Texas and Louisiana alone. The film grossed about $20 million worldwide. Godzilla vs. Megalon has attracted the ire of many Godzilla fans in the decades since its original release. The film contributed to the reputation of Godzilla films in the United States as cheap children's entertainment that should not be taken seriously. It has been described as "incredibly, undeniably, mind numbingly bad" and one of the "poorer moments" in the history of kaiju films.

The film was released numerous times in the VHS format, mostly as videos from bargain basement studios that featured the edited TV version (which was wrongly assumed to be in the public domain for many years), while PolyGram and 4 Front released the unedited version of the film in 1992 and 1998, respectively. Some rumors have circulated that the film's original VHS releases in the States were uncut, but there is no evidence confirming or denying this. Media Blasters acquired the DVD rights to both Godzilla vs. Megalon and Destroy All Monsters. Both films were released under one of the company's divisions, Tokyo Shock. Media Blasters originally planned to release Godzilla vs. Megalon on DVD and Blu ray on December 20, 2011; however, because of technical difficulties with the dubbing and Toho having yet to give its approval for the release, the DVD/Blu ray release was delayed. Media Blasters finally released the film on August 14, 2012, but only on a bare bones DVD and Blu ray. Despite this, a manufacturing error led to several copies of the originally planned version featuring bonus content being released by accident. These special features versions are incredibly rare and are not labeled differently from the standard version, making them nearly impossible to find. This release was commercially the first to remaster the film to its original full length version. In 2019, the Japanese version and export English dub were included in a Blu ray box set released by the Criterion Collection, which included all 15 films from the franchise's Shōwa era.