Muscarinic acetylcholine receptors are in a place.
Scooby-Doo !. Scooby-Doo. Scooby-Doo. Haunted Holidays is the second Direct-to-DVD special based upon the Scooby-Doo Saturday morning cartoons as a Christmas special , released on October 16 , 2012 on the 13 Spooky Tales  : Holiday Chills and Thrills DVD .. Direct-to-DVD. Direct-to-DVD. Scooby-Doo. Scooby-Doo. It premiered on Cartoon Network on December 4 , 2012 .. Cartoon Network. Cartoon Network