2.04 "Children Shouldn't Play with Dead Things"

Sam insists to visit ma Mary's grave, although empty and meaningless to Dean, who is however intrigued in the cemetery by the perfect circle of dead vegetation around the three days old grave of local college student Angela Mason who died in a car accident, suspecting the ground is desecrated, Sam thinks it's another diversion not to have to think about either deceased Winchester parent. Her roommate Lindsey says Angela's grieving boyfriend Matt Harrison just slit his throat, all plants in his place are also dead. Another student, Neil Levine, tells Matt blamed himself because Angela caught him with another girl the night of her accident, the boys find her grave empty except for a necromantic spell in Ancient Greek. Dean accuses Angela's pa, Dr. Mason, but Sam notices healthy plants and fears for his brother's sanity. Angela was actually resurrected by Neil, her still enamored ex, alas as a zombie who kills for revenge. Next target is Lindsey, the one she caught with Matt, but the Winchester boys are in time to save her and need to lure Angela back to her grave bed and make Neil admit she's in his house, however he refuses to help either side...