Gax resembles Vilgax, however he has black armor that has a white stripe on the chest. He has spikes on his knees and shoulder pads and has six green tentacles dangling in the front of his face. His tentacles and arms fade into brown, and he wears black, fingerless gloves. He has green sacs on the side of his head and red eyes.
Gax wears the Omnitrix symbol on his chest.
Gax is strong enough to lift the Rustbucket with relative ease.
Gax can also project powerful laser beams from his eyes.
Gax has shapeshifting arms that can change into a bunch of tentacles. These tentacles are very powerful and retain equal strength to his arms as a whole.
Gax is demonstrated to be a very skilled climber, using his sharp claws to dig into the ground.