Killjoy

A man who called forth Killjoy performs a blood pact, forging three underlings: Punchy, Freakshow, and Batty Boop. The summoner refuses to name a victim, dooming the plan to proceed in the shadows. Killjoy and his cohorts vanish back to their own world, biding their time.

Sandie and her friends guard the professor's house while he is away. A sack is left on the doorstep, and they resist opening it at first. Curiosity wins, and they bring it inside, then mount an ornate mirror on the wall.

Zilla examines the mirror and is pulled into Killjoy's realm alone. A brutal boxing match against Punchy ensues, pushing him toward the edge of death. The group later finds his body in the real world and begins reviving him.

Sandie and others revive Zilla's consciousness and remove him from the demonic encounter enough to return. A barrier materializes around the house, sealing the students inside and severing contact with the outside world.

Erica falls under the mirror's pull as Killjoy makes his presence felt, speaking to the trio through the glass. He invites them to join a grisly feast and outlines his plan to dine on Erica. The professor who summoned Killjoy returns home to witness the nightmare.

The group is drawn through the mirror and enters Killjoy's realm. Each member confronts a different demon in this other world. The staged horrors escalate the stakes for survival.

In Killjoy's realm, Zilla persuades Punchy not to become Killjoy's slave, attempting to break the clown's hold. The act sows constraints on Killjoy's control and shifts the dynamics among the underlings.

The professor escapes from Freakshow, seeking a way out of the traps. Meanwhile, Rojer is seduced by Batty Boop, risking his safety and allegiance.

Sandie keeps Killjoy's attention long enough for Batty Boop to provoke him with jealousy. Killjoy retaliates and soon kills Batty Boop, removing one threat.

The dinner scene ends in tragedy as the group fails to save Erica, who is torn apart on a gleaming silver platter. The horrific moment underscores Killjoy's power inside his realm. The group mourns and braces for the final showdown.

The professor attempts to neutralize Killjoy by reciting his original name, revealing himself as the father of Michael, whose soul Killjoy exploited before destroying him. Killjoy's response shows that souls he consumes become part of him.

Michael's spirit materializes to comfort his father as Killjoy's advantage wavers. The moment exposes deep past and motive behind Killjoy's manifestations.

With his father momentarily unguarded, Killjoy kills the professor using a giant mallet, sealing his doom. The sacrifice underscores the depth of Killjoy's threat.

Sandie and Zilla, the last two survivors, try to laugh through the terror to drown out the clown. Zilla is slain by Killjoy's taunts, but Sandie manages to keep him occupied long enough to slip back through the mirror into her world.

Back in the real world, Sandie is committed to a mental institution, still laughing uncontrollably and suspected of murdering her friends and the professor. The outcome leaves her fate tragically ambiguous.