

Heatblast is Ben's first transformation, accidentally activated in the pilot episode of the original series, "And Then There Were 10" when Ben was trying to remove the Omnitrix immediately after it first attached to him. They only seem to be weak against sufficient amounts of water or similar fire-extinguishing materials that may nullify their attacks and, circumstantially, extinguish them permanently. Pyronites are unable to lower their own body temperature, which prevents them from touching anything not fire-proof.

Heatblast is a Pyronite ( pyro- meaning fire) from the star Pyros, a humanoid magma based life-form with the ability to control heat at will in various ways, including flight by firing at the ground to propel himself like a rocket.

Michael Reisz - Ben 10 (As Kevin in "Kevin 11").4 Aliens Introduced in Ben 10: Omniverse.3 Aliens introduced in Ben 10: Ultimate Alien.2 Aliens introduced in Ben 10: Alien Force.
