A [[http://www.fanfiction.net/s/7525288/1/Old-Meets-New fanfic]] made by [[http://www.fanfiction.net/u/80745/RockSunner RockSunner]], a crossover for [[WesternAnimation/ScoobyDooMysteryIncorporated Scooby-Doo! Mystery Incorporated]].
This is a Scooby-Doo to Scooby-Doo cross-over in which the original ''ScoobyDoo'' Mystery Incorporated (from ''Scooby-Doo, Where Are You!'' to ''What's New, Scooby-Doo?'') meets the new ''WesternAnimation/ScoobyDooMysteryIncorporated''. It has spoilers to the end of the latter series.
This is a 27-chapter work so far, and it is still ongoing.
!!This fanfiction series contains examples of:
* AlternateUniverse: the original continuity is an AU to the Crystal Cove one.
* AlternateUniverseFic: A WhatIf with the insertion of the second Mystery Incorporated after the end of the first season of SDMI.
** Coolsville Velma calls herself "Dace" as a nickname to distinguish herself from her counterpart.
*** Dace is commonly believed to be Velma's middle name. She was called "Velma Daisy Dinkley" in ''Scooby-Doo! Curse of the Lake Monster''. Velma in this story lampshades the MemeticMutation that turned "Daisy" into "Dace."
** Dace mentions potential boyfriend Winsor from ''Legend of the Phantosaur''. Shaggy also has a minor reaction to the word "bad", which he shakes off. [[spoiler: He later learns how to activate "bad" mode again, with the help of Cassidy Williams.]]
* FixFic: the old Mystery Incorporated gets the new one back on track faster after their break-up, [[spoiler: with the exception of Daphne, who may take longer to rejoin them, giving Hot Dog Water a longer time in the group.]]