Jack O'Lantern is one of the antagonists of the children's television series, The Grim Adventures of Billy and Mandy. He is a minor player in the Non Disney Villains Tournament.
Non Disney Villains Tournament
Having stolen the Grim Reaper's scythe, Jack O'Lantern challenges Samhain for the title of the "embodiment of Halloween." He fires a flaming rock at Samhain with a slingshot, but his opponent effortlessly glides away. Jack O'Lantern gets smart and opens a portal of light, forcing the light-fearing Samhain to flee. Jack then summons an army of pumpkin monsters to help him eliminate Samhain. Samhain gathers a host of his own ghouls. These ghouls prove to be too much, cowering Jack into submission. The vengeful Samhain banishes Jack into the light, never to be seen again.