Baragon is a fictional Kaiju that was first featured in the 1965 Toho-produced film, Frankenstein Conquers the World. Baragon is a four-legged dinosaur with a horn on his head and large ears. His main weapon is a heat ray that he can fire from his mouth. In addition, he can jump very high and burrow through the ground.
In Frankenstein Conquers the World, Baragon was a dinosaur who burrowed underground to escape the extinction of the other dinosaurs and other prehistoric creatures died out. He adapted to and lived successfully. But when the sounds of a nearby factory disturbed and awakened Baragon, he emerged from the underground and attacked it. He appeared later at Shirane and destroyed the village. Then he emerged at a farm, where he ate the livestock - with feathers flying out of his mouth. During these attacks, Baragon was not seen, so the mutant human Frankenstein was blamed. But there was a person who survived the destruction of the factory who claimed there was a second monster that had attacked the factory. When a small group of scientists searched for Frankenstein, an explosive awoke Baragon from his sleep. He emerged to attack the scientists, but Frankenstein appeared to protect them from Baragon. The two fought a climactic battle, but Frankenstein ultimately defeated Baragon by choking him and breaking his neck. But in the end, a fissure appeared beneath the two and swallowed them up into the Earth.
In Destroy All Monsters, Baragon is seen as one of several monsters kept in captivity on Monster Island. Along with the rest of Earth's monsters, he is brought under the control of an alien race called the Kilaaks during their invasion of Earth and forced to destroy cities in their cause. It is unknown if this was the same Baragon that battled Frankenstein or another. The latter theory is supported by the fact this Baragon was smaller than the original. The 1965 version of Baragon stands 25 meters (82 feet) in height, the 1968 version stands up to 57 meters (or 190 ft) in height. He later breaks free from this mind control, and watches (but does not actually take part in) the fight against the Kilaaks and their remaining monster, King Ghidorah before returning to Monster Island with the other Earth monsters.
Baragon reappeared in the 2001 film, Godzilla, Mothra and King Ghidorah: Giant Monsters All-Out Attack as one of three ancient guardian monsters. The other two are Mothra and King Ghidorah (originally Varan and Anguirus). When Godzilla is revived by the souls of the people who died in World War II, Baragon, Mothra, and King Ghidorah were summoned to protect the nation from the threat. Baragon was the first of the three guardians to confront Godzilla and was eventually killed by the monster's atomic breath. Baragon does not have a heat ray or a glowing horn, but he still has his burrowing and extraordinary jumping abilities.
In Godzilla: Final Wars, Stock footage of Baragon from Frankenstein Conquers the World was seen during the opening claiming that Baragon was one of many monsters that arose due to the devastation that the World Wars brought, along with Varan, Gezora, Gaira, Titanosaurus, and Megaguirus.