Ultimate Swampfire

Ultimate Swampfire is the Ben's evolved form of Swampfire, Ben first became Ultimate Swampfire to battle Vilgax in The Final Battle: Part 2, being his first Ultimate transformation. ultimate swampfire is voiced by Dee Bradley baker.

Appearance
After evolution, he now has a more wood-like form with three blue gooey shells containing blue kerosene gel (said by Dwayne) that Ultimate Swampfire shoots. He appears shorter than original Swampfire, and has many of the same abilities. His pyrokinetic and chlorokinetic abilities are greatly increased, and he can still regenerate body parts.

Trivia

 * Ultimate Swampfire is the first alien Ben used as "Ultimate", reflecting on how Swampfire was the first alien Ben used in Alien Force, as well as Ben's first ultimate transformation with the Ultimatrix.
 * Cartoon Network has made a game, with him in it on Cartoonnetwork.com. He is the first form playable in an Ben 10 online 3-D game.
 * Ultimate Swampfire was originally going have a red body, with three fire colored shells on his back and the Ultimatrix sign won't grow four spikes.