Frosty the Snowman (1969)
In 1969, Rankin/Bass produced an animated feature based on the song written by Steve "Jack" Rollins and Steve Nelson and recorded by Gene Autry. Frosty the Snowman featured the talents of comedians Jackie Vernon and Jimmy Durante.
The story tells of Frosty coming to life and the children's quest to get him to the North Pole before he melts. Frosty and Karen, one of the children, board a train bound for the North Pole and are chased by the owner of Frosty's magic hat, Professor Hinkle - a magician who threw it away because he thought it defective.
The special has remained popular over the years and has spawned a few sequels including Frosty's Winter Wonderland with Andy Griffith and Rudolph and Frosty's Christmas in July.