LEGO Scooby-Doo! 75904 Mystery Mansion is a set from the first wave of LEGO's Scooby-Doo! theme. It has 860 building pieces, with seven minifigures, and additional accessories. It hit the shelves in August 2015.
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- This is set based on three episodes of Scooby-Doo, Where Are You!: What a Night for a Knight, Hassle in the Castle and A Gaggle of Galloping Ghosts.
- Fred Jones is the only member of Mystery Inc. who is not included in the set as he was already in the Lego set based on the Mystery Machine.
- This is also the only set featuring Velma, making her and Fred the only members of the gang who have appeared in on Lego set.