A PBS TV show, devised by Children's Television Workshop as a next-step show for the first wave of Sesame Street viewers. Now that one knew one's alphabet, this show dug deeper into language - syllables, the silent "e", wordplay - using a similar format to Sesame Street, but oriented towards cartoons and sketch comedy, with characters like Fargo North, J. Arthur Crank, and cartoon superhero Letterman (narrated by Joan Rivers, with Gene Wilder as Letterman and Zero Mostel as his archenemy - it's a wonder David Letterman never made use of this stuff - and your Useless Yo La Tengo Fact of the Day: Georgia Hubley's parents were part of the production team, with Georgia handling some of the child voices; this is a really, really, long digression). The cast included Bill Cosby, Rita Moreno, Morgan Freeman, and Fame's Irene Cara.