On Christmas Eve, a little boy named Timmy was read a Christmas story and tucked into bed. The resident mouse Gumdrop , while admiring the house all decorated for Christmas, noticed Timmy's letter to Santa on the floor. The letter must of have fallen off the table and never got mailed. So he and the family dog Gobber set outside to deliver the letter to Santa and save Christmas for Timmy.

Yogi Bear, Boo Boo, Huckleberry Hound and more Hanna-Barbera characters get lost and decide to spend Christmas by vising Casper, the friendly ghost. But soon they encounter a not-so-friendly ghost.

Businesswoman Sophie Throckmorton plans to sell the Jellystone Lodge, devastating the regular guests – including Huckleberry Hound, Augie Doggie and Doggie Daddy, and Snagglepuss – and it's up to Ranger Smith, manager Mr. Dingwell, and the newly awake Yogi, Boo Boo and Cindy keep the Christmas spirit alive amidst the mischievous attempts of two villains to ruin the fun.

Orphan Heidi lives with her grandpa in Swiss Alps. She brings joy to all there. However, her aunt takes her to the city to live as a servant girl to a cold rich strict family and their nice but sad handicapped daughter.