On This Day in History: Scooby-doo Airs Posted on September 12, 2019November 20, 2018 by mcdanell99 in Uncategorized Fifty Years ago today, Scooby Doo airs its first ever episode entitled “What a Night for a Knight.” You can watch it below. Share this:TwitterFacebookLike Loading... Published by mcdanell99 View all posts by mcdanell99