Gamera vs. Viras (ガメラ対宇宙怪獣バイラス Gamera tai Uchū Kaijū Bairasu) is a 1968 Japanese kaiju film directed by Noriaki Yuasa. It is the fourth entry in the Gamera film series.
Gamera, however (under the influence of the aliens), is destroying dams and cities by the handful. Jim and Masao discover a squid-like creature, thinking he is another captive of the aliens. In fact he is the leader of the aliens. The boys help Gamera break free from the brain-wave device and he begins to attack the spaceship. Grounded by Gamera, the aliens reveal that their human forms were just disguises. The aliens merge to form the giant monster Viras. Gamera and Viras duke it out in a big beachside battle. Gamera manages to pull Viras into the upper atmosphere, freezing him to death. He then flings Viras' body back into the ocean. The boys and a crowd of adults celebrate Gamera's victory.
Gamera vs. Viras was filmed at Daiei-Tokyo Studios. The film is the fourth in the Gamera film series.
Gamera vs. Viras was released in Japan on 20 March 1968. The film was never released theatrically in the United States. It was released directly to television by American International Television in 1969 as Destroy All Planets.
In a retrospective review, AllMovie stated that the film offers "everything one expects from a massive zero-budget monster battle film" while also having "unintentionally brilliant quirky moments like the hypnotized army, Japanese men with glowing eyeballs, and a fiendishly fake-looking squid alien who wishes to attack Earth for its supply of nitrogen."