Well, I guess they already did a movie team-up...It looks like there would've been a KISS episode, but it was scrapped.
There Will Be No Scooby-Doo and Guess Who? KISS Episode
Last September, some designs for KISS were stumbled upon. By process of elimination, most people assumed the one episode we did not have a full description for was the KISS episode. However, it...scoobysnax1.weebly.com