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Scooby-Doo! Return to Zombie Island is an American animated direct-to-video supernatural comedy mystery film produced by Warner Bros. Animation and distributed by Warner Bros. Home Entertainment. It is the thirty-third entry in the direct-to-video series of Scooby-Doo films and a direct sequel to the 1998 direct-to-video animated film Scooby-Doo on Zombie Island, the first film in the Scooby-Doo direct-to-video franchise. The film premiered at the San Diego Comic-Con on July 21, 2019, followed by a digital release on September 3, 2019, and a DVD release on October 1, 2019.

The gang lure a werewolf in a trap and catch the culprit: Young Man Withers. Soon after cleaning the Mystery Machine, the gang capture more monsters, including the Snow Ghost, the Creeper, and the Spooky Space Kook, who are the entire Withers family. But, as the gang congratulate themselves, the Mystery Machine goes backwards, prompting Fred to give chase before discovering that it was just a dream. As it turns out, Fred sold the Mystery Machine, and they are retired from mystery solving, thanks to the Sheriff from the 13th Ghost incident. Fred decides to come out of retirement after seeing a news report, though Shaggy and Scooby refuse, saying that they've been taken for granted in all their mysteries. The pair make Fred, Daphne, and Velma promise never to solve another mystery. The gang decide to have a vacation and soon see a TV program featuring Elvira, who announces that Shaggy Rogers is the winner of a tropical vacation, much to the gang's confusion and Shaggy and Scooby's delight.