When a letter addressed to Santa arrives at Porter’s house by mistake, Porter makes it his mission to safely deliver the letter to Santa. But first, Porter must find out who Santa is! With lots of determination and a little help from his friends, Porter sets out on an adventure that takes him sliding across the Seven Glacier Arches, swimming the dangerous waters of Killer Whale Cove, and climbing the dreaded Snowman Mountain. Along the way, Porter discovers who Santa is from an unexpected place and comes up with a very creative way to deliver the letter to Santa.