Herbicidal Maniac (S06E10)

General Skarr, determined to eliminate a pesky weed from his immaculate garden, enlists Grim's help with his scythe. However, chaos ensues when Billy takes charge of a lawnmower, inadvertently destroying the entire garden. In the process, the scythe's magic backfires, transforming Skarr into a plant-like being. Embracing his newfound botanical abilities, Skarr revamps his garden and plots revenge on Billy by throwing a lavish party, culminating in an attack. Ultimately, Skarr meets his downfall when a helicopter rotor mulches him, leading to his reincarnation as a tiny weed.