Baragon is a subterranean reptile kaiju who first appeared in the 1965 Toho film Frankenstein vs. Baragon, and later debuted in the Godzilla series in the 1968 film Destroy All Monsters.

The original Baragon from Frankenstein vs. Baragon was a villainous creature that came to the surface to feed on livestock and people. As the creature only surfaced at night, most people blamed Frankenstein for the beast's attacks. When Baragon threatened Frankenstein's caretaker Sueko Togami, Frankenstein challenged him to battle, and successfully killed him only to fall into a fissure caused by Baragon's burrowing. The second generation Baragon in Destroy All Monsters was living on the human-monitored Monsterland facility at the end of the 20th century, and disappeared after the Kilaaks invaded the island and took control of the monsters. Baragon later appeared at Mount Fuji and witnessed the battle between the Earth monsters and King Ghidorah after the aliens' mind control was severed. Baragon's next film appearance came in the Millennium series film Godzilla, Mothra and King Ghidorah: Giant Monsters All-Out Attack, where he was the first of the three Guardian Monsters to battle Godzilla.