Spotting a spooky house on a barren asteroid, Amy Pond commented "Scooby-Doo wouldn't be seen dead in there". The Eleventh Doctor replied "Scooby-Doo's a pussycat. Well, OK, I know he's a dog, but he's a scaredy-cat dog". (PROSE: Secret of Arkatron)
When the TARDIS struggled to dematerialise from the seabed of the Atlantic Ocean, the Eleventh Doctor put on an old diving suit to investigate. As he left, he told Freydis and Henrik "Now I will go and terrorise Scooby Doo". (PROSE: Dark Horizons)
In 2015, "a Scooby" was modern slang that meant "a clue." Andy Hansen used the term when she did not know how to get home after being transported back in time to ancient Greece. (PROSE: The Last Pharaoh)
Scooby-Doo appeared as a playable character in LEGO Dimensions.
The line "Now I will go and terrorise Scooby Doo" in Dark Horizons is a reference to the Scooby-Doo villain, the Ghost of Captain Cutler, who appeared as a ghostly diver in an old-fashioned deep sea diving suit.
In response to a fan suggesting a story where the Doctor met the Scooby gang, the official Big Finish Twitter account posted an image depicting, among other things, Scooby-Doo with K9's head.[1]
