As the gang reunites, they find that the studio back lot has been plagued by a series of mysterious incidents, including unexplained noises and sightings of a shadowy figure. The gang initially brushes it off as a publicity stunt, but as they investigate further, they begin to realize that there may be a real monster lurking around.
While reminiscing about their past adventures, the gang sees parallels between their old cases and the current situation. They use their knowledge and skills to piece together clues and solve the mystery, all while navigating the challenges of working in a movie studio.
Along the way, they encounter a plethora of characters from the studio, including egotistical directors, quirky props masters, and tech-savvy interns. Velma displays her genius intellect, Fred his leadership qualities, Daphne her bravery, Shaggy his humor, and Scooby his loyal friendship.
As they unravel the mystery and come face to face with the monster, they must use their combined strengths to defeat it and preserve the legacy of the Scooby gang. The film ends with a heartwarming tribute to the franchise and the beloved characters that have captivated audiences for over five decades.