Brundo the Decemberween Yak and the Sword of St. Olaf
From Homestar Runner Wiki
Brundo the Decemberween Yak and the Sword of St. Olaf is a stop motion Decemberween special, in the style of the Rankin/Bass Christmas specials, starring Brundo, his sidekick the Elf, and narrated by the sheriff. Brundo and the Elf help to return the sword of St. Olaf to its rightful owner and learn the true meaning of Decemberween. Strong Bad and the gang (minus Bubs) watched this special on the Telebision in Strong Bad's basement in Happy Dethemberween. The trees used in the special are made from Little Debbie Christmas Tree Cakes. The animation style is reminiscent specifically of The Island of Misfit Toys. Strong Sad does not understand how a mystical sword has anything to do with Decemberween. This could be based on The Life & Adventures of Santa Claus, which had an epic fantasy battle scene.