A young man and his girlfriend move into the man's old mansion home, where he becomes possessed by a need to control ancient demons.

Ghoulies II picks up a short time after the first movie, a few of the little nasties stow away on an amusement park ride and bring big bucks to a dying fair. The creatures are mad after an attempt to kill them, so the creatures go on a rampage through the fairgrounds, ultimately leading to an explosive conclusion!

A college teacher brings the little creatures back to his campus, where they proceed to terrorize the faculty and students.

While in pursuit of cop Johnathan Graves, his demonic nemesis, Faust, sends his disciple Alexandria to hunt down the amulet that will set him free. Meanwhile, the Ghoulies find their way through an open porthole and onto the streets of L.A., creating madness and mayhem as they search for a way to get back home. As the body count rises, it becomes an ultimate battle between a demonic killer, a rule-breaking cop, and our favorite creatures from the netherworld!