Gax

"Hail the Gax!" - Gax in Omni-Tricked: Part 1
Gax is the Omnitrix's sample of a Chimera from the planet Vilgaxia. He made his debut in Omni-Tricked: Part 1 and is voiced by Yuri Lowenthal. Vilgax absorbed Gax in Omni-Tricked: Part 3 to complete his form, thus removing him from the Omnitrix.

Appearance 

Gax is a huge, muscular octopus-like alien who wears black armor. Gax's muscles are actually tentacles that are curled into each other to form arms and wears black, fingerless gloves. He has grey spikes on his shoulder and knee pads as well as two toes. He has a white stripe on his chest and three tentacles on his face along with red eyes.  He has white, circuit like lines on his legs and has green sacks on the side of his head. The Omnitrix is on his chest.

Powers and Abilities

Gax's has enhanced strength and is very durable, his arms are able to unfold into tentacles that are strong enough to lift his body to climb a mountain. He is also able to shoot powerful red lasers from his eyes that can cause fire. Vilgax is also pretty acrobatic, being able to do cartwheels with ease. 

NEW ALIEN GAX AND VILGAX RETURNS? - Ben 10 Reboot New Episode Omni-Tricked Part 1

A four parter special entitled "Omni-Tricked" has aired in the UK. The plot revolves around a malfunctioning Omnitrix that is turning Ben into all of his different alien forms, including a new one named Gax, the same species as Vilgax. Speaking of which, Vilgax has also appeared, where he supposedly helps Ben to control the Omnitrix. We also get to see Vilgax's ship, the Chimerian Hammer and the bounty hunters Six Six, Kraab and Tetrax. Phil is also rumored to appear in Omni-Tricked Part 2, to help Ben fix the Omnitrix. Check out some of the images below:

Here we get to see the three bounty hunters from the original series; Six Six, Kraab and Tetrax, who are emerging from a portal. Their designs looks almost exactly the same as their original series counterparts.