Ultimate Swampfire is a playable alien.
Like Swampfire, Ultimate Swampfire can control the growth of nearby plant life and is nearly impervious to physical harm. But, Ultimate Swampfire doesn’t tear apart when he is hit and grows back together. His body is more like petrified wood, making him tougher and more resistant to damage than Swampfire. The blue parts of his body are sacks of napalm, which he can pull off, throw, and explode into fireballs.