Barugon

An expedition headed deep into a cave, discovering Atlantean murals along the way depicting a reptilian monster. After a long journey they found a giant skeleton with a gem in its skull. The expedition force, already stressed from the journey and dark surroundings, had several members suffer insatiable greed and mania when the cave started to flood after the skeleton broke. One member tried to steal the gem and slashed his comrades with a knife, only to be shot in the face by another manic member of the party, which spilled blood onto the gem. The shooter managed to flee into the jungle and leave on a plane, leaving the only other survivor in the cave, where he experienced visions that implied Barugon was an earlier attempt at creating a counter to the Gyaos before Gamera. Aboard a ship, the gem quickly hatched into Barugon, and preyed upon the shooter before rapidly growing in size. He attacked a city, inducing mania in the populace before the JSDF confronted him. Barugon shot down their craft with freezing waves emitted from the tip of his long tongue. When warships came to attack him, he retaliated using his Rainbow Death Ray. Gamera, after learning from Asagi Kusanagi of Barugon's assault, came to fight. Gamera broke Barugon's tail using his plasma fireballs, but Barugon fought on. The former's icy blasts and the latter's fireballs created a temperature gradient that started producing large storms in the region. It was discovered that Barugon had a weakness to water when he tried to escape after being thrown into Tokyo Bay. He froze Gamera before going about freezing Tokyo. Eventually, Gamera thawed out, and the two fought again on an iceberg made by Barugon. Although Gamera was gravely wounded during the battle, Barugon was blown off the iceberg by Gamera's fireballs and sank into the sea.