Scooby-Doo, Where Are You? issue 21 is the twenty-first issue of Scooby-Doo, Where Are You? published May 9, 2012 (cover date July 2012) by DC Comics.
- The Case of the Haunted Huddle
- Gridiron Ghoul (reprinted from Scooby-Doo! #102)
- The Dragon in the Bathroom (reprinted Scooby-Doo! #106)
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