BULLTON

Found living in two meteorites which crashed on Earth in 1966, Bullton is composed of two small amorphous creatures which, when put one near the other, generate a gigantic centralized mass with several short tentacular limbs arrayed in all directions, many of which ended in orifices from which antennaes can extend which can emit energy whihc warp sapce and time. Bullton's body appears blue , gray and red. On a planet, it moves by rolling over.
Source: Ultraman "Passport ot Infinity"

MEPHILAS SEIJIN

Mephilas Seijin is an advanced species of biped with telepathic abilities which developed space flight. A Mephilas came to Earth in 1966 with projects of conquest. After being thwarted, it left the planet.
The Mephilas that came to Earth could fly, produce lightning bolt from their fingers as well as immobilizing rays, change size and teleport at will. It also had the power to resurrect dead individuals. It remains unknown if those abilities are natural or artificial, ot even representative of the species.

Source: Ultraman episode 33 "The Forbidden World"

ZARAB SEIJIN

Zarab Seijin are a an advanced species which developed space flight. They are 2 meters tall biped but can increase their size about 20 times and can change shape to imitate other lifeforms. It is not known if these abilities are natural or articificial.
Zarab Seijin came to Earth with intentions of conquest in 1966 but were thwarted.
Source: Ultraman

ZETTON SEIJIN

Zetton Seijin are a technologically advanced species of bipeds which developed space flight. They are 2 meters (6.56 feet) tall and weigh 60 kg. With two legs and two arms, they have a large cylindrical head with a with a kind of antenna organ on top of it. They can shapeshift but it is not known if this ability is natural or artifical.
They came to Earth in 1966 and attempted to conquer the planet using a 60 meters tall monster called Zetton. Zetton resembles a giant horned humanoid beetle with a glowing yellow streaky mouth down his face, striped yelloy black limbs and powerful black armor plates on the torso. The yellow panels on his chest are thought to be compound eyes. Where eyes are on most creatures, he has two sensory pits which can emit sonar or radar signals. Where ears would normally be are sensors that acquire the reflected signals. It can shoots 1-trillion-degree-Celsius Fireballs from his mouth, absorb energy waves and rays and recast them from his hands and create a protective force field around him. It is unlikely that Zetton is the product of natural evoluton and is most probably a creation of Zetton Seijin science.
Source: Ultraman TV series