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Tearjerker: Scooby-Doo on Zombie Island
During the opening, Daphne mentions in an interview that even though she and the rest of the gang eventually got tired of solving Scooby Doo Hoaxes, she still misses her friends. Scooby and Shaggy happen to watch this interview on TV, and admit to feeling the same.
Turns out the zombies are not the bad guys, their souls just could not rest until the real monsters were finally put to justice.