Santa is getting less and less Christmas letters. It turns out that a boy named Leon is persuading people to stop believing in Santa Claus! Santa and the elves discover that Leon's letter got lost years ago, wanting his dog Lenny back who was given away to a lady who wanted to dye him pink, as she did for all her dogs, but he ran away. Since Santa didn't give him his dog back, Leon started doing this, going as far as ripping his brother Humfrey's letter. Santa and co get Lenny back and Leon finally learns that Santa is real.