Zetton

Zetton or Z-Ton is the monster specially created by a Zettonians to defeat Ultraman, said to be "the strongest monster in universe" by the time it was created. Proud of their creation, Zettonian named the monster after their home planet.

Zetton resembles a giant horned humanoid beetle (although it has subtitle suggest to be a dragon) with a glowing yellow streak down his face (in lieu of a mouth) and torso, striped white limbs and black armor skin. The yellow panels on Zetton's chest are actually compound eyes while its "eyes" are two sensory pits, use to emit sonar or radar signals. Where ears would normally be are sensors that acquire the reflected signals. Zetton's roar is a series of beeps and a low pitched voice that utters "Zet-ton".

Zetton can shoots fireballs, said to be 1-trillion-degree-Celsius, from its mouth and can create a force field which resembles Baltan's. Unlike Baltan's force field, Zetton force field cause Ultraman's Ultra Slash energy saw to shatter upon contact. The force filed is also capable of absorbing Ultarman's Specium Ray, then convert it and shoot back in form of energy wave from its hands, Zetton Final Beam. On top of these abilities, Zetton is also capable of teleportation over short distance. It also has strength that far surpass Ultraman and can break free from his energy binding ring easily.

In Ultraman
Zetton appeared after Science Patrol manage to take down the massive force of Zettonian, but the Zettonian mothership release Zetton before it was detonated. Zetton quickly approached the Science Patrol headquarter and battle Ultraman. Despite his best effort, none of Ultraman's atatck has effect on Zetton. In the end, Zetton use its Zetton Final beam to damage Ultraman's vital Colour Timer. With Earth's giant guardian defeated, Zetton continue to destroy the Science Patrol headquarter but eventually destroyed by Earth's new experimental missile.

In other series
Being the first monster to defeat Ultraman, it isn't surpise that other races have replicate Zetton and used in their attemp to conquer Earth. Such attemp including Batian's Zetton II which has its right hand replaced with napalm launcher. Although Zetton II proved to be as tough as the original, Ultraman Jack manage to destroy it by use Ultra Hurricane to lift it in air and use the Specium Ray while Zetton II unable to use its force field.

Another Zetton was used by Psycho Baltans against Ultraman Powered, this Zetton has smaller arms and can spread its wings. It got destroyed by three succession shot of Powered's Mega Specium Ray.

Another variant known as Zetton EX also exist.