Richard Williams' A Christmas Carol
Animated by hand in a dark Victorian style, this Dickens Christmas classic has almost fallen into obscurity due to age. It was directed by Richard Williams (Who Framed Roger Rabbit), produced by Chuck Jones (Warner Bros, Looney Tunes, The Grinch, etc.), and primarily drawn by Ken Harris. It tells the familiar tale of Scrooge, but lights it in the gaslamp style of Victorian ghost stories (which it is). In 1972, it won the Academy Award for Best Animated Short Film and to this day remains the only film adaptation of the story to be so honored.
Merry Christmas to you all.