Scooby Doo and Shaggy disguise themselves as potential buyers and after Coco offers to give them a costume if they kill the mystery gang, she is caught and sent to prison.

At the library, they are attacked by ghosts but escape and confront Trevor at his new shop when Coco determines that the costumes matched his style of design.

Trevor reveals that he sent four costumes of Victorian-era style to Coolsville Penitentiary, and the gang discovers that Coco broke her heart monitor and escaped.

Coco offers a false confession, but the gang sees through it and determines that the warden is holding Esteban hostage and is behind the whole thing.

[5] In a review for Autostraddle, Heather Hogan called the film "A very funny movie for people who grew up on Scooby-Doo.

Lesbian actress Hayley Kiyoko, who played Velma in the live-action television Scooby-Doo films directed by Brian Levant, said she was "happy for her".