Luigi is making Mama Mario's meatball and zucchini recipe, but is uncertain of the exact ingredients and asks Mario to look up the recipe in their mother's recipe book. Mario agrees, but is distracted watching Elvira on television and accidentally grabs an evil-looking book titled The Book of Curses instead. Mario lists a number of unconventional ingredients like "hair from a witch's wart" and "a couple of bats' tongues". Luigi tastes the resulting concoction just as Mario declares it to actually be a recipe for "The Curse of Celero", which turns anyone who tastes it into a mindless zombie. Luigi starts mumbling senselessly and wandering around the kitchen. Just as Mario is wondering what to do, Elvira announces that she is currently in Brooklyn and accepting live callers, and Mario calls in asking for help.
The scene then cuts to Elvira and Mario at Mario Brothers Plumbing, regarding the zombiefied Luigi. Elvira admits that she's "a little rusty" but agrees to attempt a spell to turn Luigi back to normal. However, instead of fixing Luigi, her attempts turn him into a mummy and a werewolf. Elvira gives up, but Mario decides to try reciting "the rain in Spain stays mainly on the plain" on the basis that "it works in movies". Though Elvira expresses disbelief at this, the incantation does appear to have some effect, and the three start to dance around the room singing the lyric. Eventually, Luigi starts to sing the song in his normal voice, revealing him to be cured. Mario, in his excitement, absent-mindedly drinks from the pot with the curse in it and turns into a zombie himself.
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