Ultimate Heatblast is a liquid-metal organism with two large tendril-like arms, two normal arms and a back tendril. He has gray metal plating and dark red mercury based fluid suspended underneath. His face resembles a skull-and-crossbones emblem situated on a rotund dome of his mercury based-fluid.
The Ultimatrix symbol is located on a side facet of his chest.
- Superheated Body- Ultimate Heatblast's body is superheated to the touch, anything that would burn.
- Malleable Tendrils- Ultimate Heatblast is able to whip his arms around as tendrils and change their shape. These tendrils are used to lift himself in the air as an evolutionary exchange with an increasing inability to fly.
- Mercury Toxicity- Ultimate Heatblast's mercury body is incredibly toxic when eaten to ward off Crabdozers. If consumed, it is enough to kill a Crabdozer twelve times over.
- Aerial Movement- Ultimate Heatblast is unable to fly due to not being able to project fire from his body.