The 13 Ghosts of Scooby-Doo (1985)

S1E5 That's Monstertainment

Title: That's Monstertainment Plot: Zomba, a horror show host who has recently escaped from a demon prison, uses his powers to whisk Scooby and his friends into the world of "The Son of the Bride of the Ghost of Frankenstein." The gang must navigate this eerie cinematic landscape, facing off against classic monsters and unraveling the mysteries that lurk within the film as they seek a way back to reality.