It is an unwritten rule of television that you can't have a long-running sitcom and not do at least a few holiday-themed episodes ... from the traditional ("Happy Days") to the newfangled ...
In one particular season two episode of Happy Days ("Fonzie ... O’Rourke as her daughter Heather in season 10. HAPPY DAYS - "All I Want for Christmas" 12/14/82 Linda Purl, Heather O'Rourke ...