A dog and a mouse head for the North Pole to deliver a lost letter. Hanna-Barbera superstars lend a helping hand to the world's friendliest ghost. The greediest boy in the world discovers the magic of giving. What could three such different tales have in common? Hanna-Barbera and Santa Claus, that's what! Hanna-Barbera assembled its mightiest talents of pen and voice to produce one of its first forays into prime-time animated Christmas