|What's missing, Scoobypedia?|
The Queen of Hearts appeared in Scooby-Doo's nightmare about Alice in Wonderland.
The Richie Rich/Scooby-Doo Show
She met Shaggy Rogers, Scooby-Doo, and Scrappy-Doo at the tea party of the Mad Hatter, and said she hated tea parties. When Scrappy challenged her, she said, "Off with their heads!". It looked like the Cheshire Cat was going to carry out that sentence on Scooby, just before he woke up. (Scooby In Wonderland)