Latest update:
Info on Ben's Scooby Doo episode
The Ben McKenzie Support Group
A friend of mine sent an email to the Cartoon Network and asked about Ben's Scooby Doo episode. She got this response today:
Thank you so much for your interest in Scooby-Doo! Mystery Inc. Mr. McKenzie will be in an episode entitled “The Wild Brood,” playing a character named Odnarb. This episode is later in the season and an airdate has yet to be determined, but please keep checking your listings!