The show was hosted by four youths in auto racing attire with
chassis on their shoulders. They included a boy, 4U (Mark Hennessy), and a girl, Euphoria, who were the "good kids" of the show, and they taught lessons to the reckless Fast Lane, a fiery-haired teen with a flame-decorated chassis on his shoulders and the chubby, impressionable Couch Potato. These sketches were under five minutes in length, and their lessons were restated by
Bob Keeshan (as
Captain Kangaroo), and the youths also did commercial bumpers. While this material was originally credited, no resources have made note of who was involved, and it is omitted from rerun packages. ==Cartoons==