As Scooby and the gang explore Brickton Studios, they encounter famous movie monsters like Dracula, Frankenstein's monster, and the Mummy auditioning for a mysterious film. However, things take a spooky turn when the Headless Horseman makes an appearance and begins causing chaos on set.
With the help of their trusty Mystery Machine and the guidance of a helpful studio employee, Scooby and his friends must navigate through the strange occurrences and unravel the mystery of the haunted Hollywood studio. Along the way, they discover secret passages, hidden clues, and encounter frightening obstacles as they race against time to solve the case and save the studio from closure.
As the gang tries to piece together the puzzle, they realize that there may be more to the legends and rumors surrounding the studio than meets the eye. With plenty of laughs, thrills, and surprises along the way, Lego Scooby-Doo!: Haunted Hollywood is a fun-filled adventure that combines humor, mystery, and a dash of movie magic.