Rudolph the Red-Nosed Reindeer (lost color negatives to original credits sequence; 1964)
Debuting on NBC on December 6, 1964, is the classic Christmas special Rudolph The Red-Nosed Reindeer, created by Rankin-Bass. There are actually two credits sequences to this special. The first one is the one that first aired with the special. Basically, it just shows an elf displaying presents with the names of the staff of Rankin Bass who worked on the special and then dropping them from the sleigh. However, the second credits sequence has an interesting story.
Originally, King Moonracer asked Rudolph to hold a promise where he would have Santa come to the Island of Misfit Toys, and pick them up in his sleigh, giving them to the children of the world. However, fans of the special protested at the first credits sequence, and the ending entirely, because Rudolph and Santa weren't seen fulfilling the promise.
Rankin-Bass responded by making an entirely new sequence where they drop off the toys to the children of the world, discarding the original sequence entirely. The black-and-white version of the original ending was eventually uploaded to YouTube, and it is currently unknown if the original color version still exists.