So DC has apparently decided to throw the Mystery Gang into every single one of their properties. First, they meet Bat-Mite who changes them into several things including children, apes, and ponies:
http://www.razorfine.com/wp-content/...p-3-change.jpg
https://i.chzbgr.com/maxW500/8101342976/h101FE712/
Then they meet the Justice League and help out when the Legion of Doom shrinks the heroes (unfortunately I think it's offscreen):
http://viewcomic.com/scooby-doo-team-up-012-2014/