While Megalon possesses limited intelligence (he must be led to his destination by the protagonists' robot, Jet Jaguar), he makes up for it with his strength.

Megalon has two drill-like front appendages, which it uses both for burrowing and as weapons, and it possesses a set of wings usually covered by a beetle-like shell.

The Seatopians unleash Megalon on the surface world as revenge for the damage caused to Seatopia through reckless nuclear testing.

Megalon appeared on the West coast of Africa in 2012 and crossed the continent, destroying countless nations, and disappeared into the Indian Ocean.

After destroying the Philippines, Megalon attacked Okinawa, but was intercepted by King Caesar, a guardian deity of the island, and both monsters died in the resulting battle.