Seymour Krelboyne (Jonathan Haze) is a shop attendant in a deteriorating flower shop owned by Gravis Mushnik (Mel Welles). In an attempt to save himself from being fired, Seymour introduces Mushnik to a plant he claims to have bred himself from a Venus flytrap and a butterwort. The plant’s name is Audrey jr. after another employee of the florist named Audrey (Jackie Joeseph) who Seymour has a secret crush on. The plant is sickly, so Mushnik directs Seymour to nurse it back to health, which Seymour does with an accidental discovery. The plant eats blood. As Seymour feeds it his own blood, the plant continues to grow until it is so large it begins to talk (Charles B. Griffith) and demand more food. Seymour finally resorts to feeding it people, yet the plant continues to say, “Feed me!”