Swamp Thing

Swamp Thing (voiced by Mark Hamill) was once a scientist named Alec Holland who was attacked by criminals who used explosives to kill him. Instead, his body fell into the swamp where he was reborn as a creature of living vines, grass and moss. As a new champion for the Green, Alec Holland became Swamp Thing, a protector of the natural world and an outcast to humanity due to his freakish form.