Now, here's a holiday treat long forgotten, as it hasn't aired on cable in years.
DePatie-Freleng produced The Bear Who Slept Through Christmas for NBC in 1973, and assembled a star-laden cast for the 30-minute special. Tommy Smothers is the bear in the title, as Ted E. Bear, whose curiosity about Christmas has him postponing his hibernation for a while. The voice cast also includes Arte Johnson (Rowan & Martin's Laugh-In), Barbara Feldon (ex-Get Smart), and, as the narrator, in his first gig for DFE, radio & cartoon icon Casey Kasem.
Edit, 6/25/19: Have to change the video. This trailer will suffice for now.