Herbicidal Maniac is the sixth episode of Season 6 on The Grim Adventures of Billy and Mandy.
Skarr is doing a lot of gardening in order to win the "Good Neighbor Award". When he spots a dandelion, Skarr tries to exterminate it. He called Grim for assistance. Then Billy comes and ruins Skarr's garden with the mower. Strange glowing tendrils wrap around Skarr, and give him the power to bring plants to life. After discovering this, Skarr then uses his newly given powers to grow a superb garden, then uses them to destroy Billy, but failed. Then he tries throwing a party to trap him and try to turn him to shreds, but then he drops his award into the mower, which then explodes. After two weeks, Billy is still trapped, but Skarr returns as a sprout.
Skarr: Now that is one handsome yard. A yard worthy of winning the coveted Endsville Good Neighbor Award. When I have that award, I shall place it here upon this perch for all to see. And as they roll by in their minivans, their children will weep burning tears of joy at the sight of my front yard. And they shall say: There! There lives General Skarr! There lives... (spots dandelion)
- Johnny Bravo can be seen flexing his muscles in the background of Skarr's pool party.