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Invaders #1 (1974), Giant-Size Fantastic Four #3 (1975)
Tun located in the Ring Nebulae M-57 star system.
The Axi-Tun created technology that gave them the capability of faster than light travel, which is superior to Earth.
The Axi-Tun have a normal humanoid appearance, which includes two eyes a nose and a mouth. They two hands with four fingers an opposable thumb, two legs with five toes. The average height of an Axi-Tun is about 6' 4," and they possess a pink skin pigment.