Who does not help pull Santa's sleigh when he delivers presents on Christmas Eve?

Rudolph used to be the one who did not help pull Santa's sleigh. His shiny red nose was so bright that the other reindeer made fun of him and shunned him. Then, on a very foggy night when Santa was not sure he would be to deliver presents, everything changed for Rudolph. His bright shiny nose made it possible for Santa to make his yearly rounds. In fact, Rudolph led the rest of the reindeer. He was not only accepted after that, but loved by all!