|DESIGN||Ed Christie designer/builder|
They appeared in Episode 1939 where they try to decide how many of them there would be if one of them left, with David teaching them subtraction to figure out. At the end of the same episode, they provide a "rock concert", doing their own rendition of the Sesame Street Theme.
Footage of the characters is not currently available, but at least three of the characters existed. One of them, labelled Rockhead #3, is on display at the Center for Puppetry Arts as of March 2016.