Ultimate Swampfire

Ultimate Swampfire is the evolved form of Swampfire. His first appearance was in The Final Battle: Part 2, making it Ben's first ultimate transformation, a reference to Ben's transformation to regular Swampfire in Ben 10: Alien Force, being his first transformation when he puts on the Ultimatrix. He appears in Ultimate Alien, as one of Ben's new aliens. He is voiced by Dee Bradley Baker.

Appearance
After the induced evolution, Swampfire now appears as humanoid tree with three blue gooey shells containing an organic, blue-colored kerosene gel-like solution(as confirmed by Dwayne McDuffie), that Ultimate Swampfire shoots out and ignites, creating more intense, blue-colored flames. He is the same size as original Swampfire. He has many of the same abilities. He also has the same feet as Swampfire. He now has a blue Heatblast-like face inside a blue bubble.

Abilities
His pyrokinetic and chlorokinetic abilities are greatly increased, and he can still regenerate body parts. His speed is also the same as his original form but he makes up for it with his lethal fire bombs that have knocked even Vilgax out cold. Ultimate Swampfire shoots blue flames while Swampfire shoots ordinary-colored fire. He also shoots a huge pyrokinetic beam when he combines his hands together. He also posseses super strength.

Alien Force
The Final Battle: Part 2

Trivia

 * Ultimate Swampfire is in an online Ben10 3D game called Ultimate Crisis.
 * In a beta Ben 10 action comic cover Ultimate Swampfire appeared to resemble Heatblast, being red, while the kerosene shells were yellow.
 * He and Ultimate Echo Echo have yet to be seen in Ben 10: Ultimate Alien.

Normal Form

 * Swampfire