The Stuff (1985)
Are you eating it ...or is it eating you?
A new ice cream-like product becomes immensely popular, taking the entire country by storm. Finding their livelihood threatened, a group of ice cream moguls employ an industrial saboteur to uncover the creamy sensation's ultrasecret formula. Teamed with a fallen cookie entrepreneur, he learns that, although it doesn't have any calories, the stuff possesses one highly undesirable side-effect; it turns people into murderous zombies. With time running out, the two must wrest the world from the grip of this deadly delight.