You might be wondering: Is this legal? The Internet Archive operates under fair use and US copyright law regarding orphaned works and preservation. Godzilla vs. Mechagodzilla II is still technically under copyright by Toho Co., Ltd.
However, Toho has historically allowed "fan preservation" of older films that are no longer in active commercial distribution in specific regions (e.g., Region 1 DVD out of print). The versions on the Internet Archive are not profit-driven; they exist for cultural preservation. That said, if you love the film, support the official release should Toho or Criterion ever issue a Heisei-era box set. Think of the Archive as a free library, not a piracy hub.
Unlike Night of the Living Dead or other public domain classics, Godzilla films are aggressively protected by Toho Co., Ltd. If you cannot find a full-length video file, it is because:
Released by Toho in 1993, Godzilla vs. Mechagodzilla II (ゴジラvsメカゴジラ) is the 20th film in the Godzilla franchise and the fourth entry in the Heisei era (1984–1995). Do not confuse this with the 1974 film or the 2002 Millennium film Godzilla Against Mechagodzilla. This is the "Heisei" version where Mechagodzilla is built from the remains of the original Mecha-King Ghidorah.
The Plot in a Nutshell: The United Nations establishes the G-Force, a specialized anti-Godzilla task force. Their secret weapon is Mechagodzilla (aka "Super Mechagodzilla"), a towering robot built using recovered 23rd-century technology. However, as the final battle looms, a second giant monster emerges: Rodan, who is protecting a mysterious egg. The plot thickens when Godzilla arrives, and the three titans engage in a brutal, three-way war on the island of Birth Island. The film is famous for its emotional core—Godzilla’s psychic connection to the egg’s occupant (Baby Godzilla, later Godzilla Junior)—and for featuring some of the most complex practical effects of the 1990s.