Ghoulies

As a child, Jonathan was almost killed by his father, Malcolm, during a satanic ritual. After being saved and raised by Wolfgang, who has kept him unaware of his background, Jonathan inherits Malcolm's house and moves in with girlfriend Rebecca. During a party, he jokingly performs a ceremony described in one of his father's books on black magic, not realizing he has unleashed small, demonic creatures known as "Ghoulies."