In this animated adventure, the beloved Mystery Inc. gang finds themselves in a spooky castle filled with secrets and surprises. As they unravel the mystery of a haunted knight, the team must use their wits and teamwork to solve the case. Directed by Rick Morales, this film combines the charm of the classic Scooby-Doo series with the playful creativity of Lego animation. Featuring the voices of Frank Welker, Grey Griffin, and Matthew Lillard, the movie offers a delightful mix of humor and suspense. For those interested, it can be viewed for free on 123Movies / Movies123.