Scooby-Doo! and Kiss: Rock and Roll Mystery

The Mystery Inc. gang arrives at Kiss World with the plan to witness the big Halloween concert and crack a park-related mystery. They sneak past security and are entered despite Delilah Domino's bans for vigilantism. The team stays focused on gathering clues while the park buzzes with spectacle around them.

Security chief Delilah Domino initially blocks the gang from entering Kiss World, citing safety concerns. When Kiss themselves arrive, she reluctantly allows Mystery Inc. to stay, though she remains wary of amateur detectives who might complicate her plans. The tension between security and investigation sets the mood for the evening.

The Demon, Gene Simmons, is wary of the newcomers after Scooby's water gun moment, but he slowly softens and agrees to a begrudging cooperation. Kiss members and Mystery Inc. form an uneasy alliance as clues start to surface. The growing camaraderie is tempered by the looming threat around them.

Shaggy and Scooby are chased by a mysterious entity through the park, and Kiss rushes in to help. They explain that the terror is the Crimson Witch haunting Kiss World and that she must disappear before the concert. The team realizes they are entangled in a supernatural plot that could derail the show.

Delilah blames park supervisor Manny Goldman for the damage and threatens to shut down Kiss World for safety. She vows to track the gang down and arrest them, using security as a tool to maintain control. The power struggle between park leadership and Mystery Inc. escalates.

Chikara, a barefoot fortune-teller, warns that the Crimson Witch comes from Kissteria and plans to use the Black Diamond to summon a monster to conquer Earth. Velma struggles to accept the claim, weighing it against her scientific instincts. The warning sets the stage for a perilous cross-dimensional crisis.

To stop the Crimson Witch, the gang uses the Black Diamond to lure her out, but she chases them through a portal to Kissteria. In Kissteria she steals the diamond and unleashes The Destroyer, forcing Mystery Inc. and Kiss into a pulse-pounding spaceflight to halt the monster. The interdimensional threat raises the stakes far beyond Kiss World.

They race through space aboard a spaceship to confront The Destroyer and manage to halt the monster's advance. After the battle ends, they awaken back on Earth as if the whole adventure might have been a gas-induced hallucination. The group exchanges unsure glances, wondering what parts were real.

Back home, Mystery Inc. unmasks the Crimson Witch as Delilah Domino, exposing her true goal to sell the Black Diamond to a rival defense company and keep the gang out of the loop by masking it as safety concerns. The revelation robs her of control and invites legal peril. Kiss pledges to assist with the fallout.

Delilah vows to sue Mystery Inc. for exposure, insisting she was protecting park safety. Mystery Inc. braces for reputational damage and legal threats. Kiss offers to handle the legal fallout in court, signaling an uneasy resolution to the confrontation.

In a breezy denouement, Starchild shares a kiss with Daphne, who returns the affection with a kiss on Fred's cheek, much to his delighted astonishment. The Demon grins at Shaggy and Scooby as Kiss sails off with the Black Diamond toward the Smithsonian. The park's mystery ends with a confident departure.

Back on Earth, Shaggy wonders aloud if they should tell Velma about the extraordinary events. Scooby shrugs and quips, 'Why rock her world?' leaving the question hanging in the air. The ending hints at secrets kept and mysteries to be solved another day.