In “Hooves of Fire,” Rudolph's son Robbie (voice of Ben Stiller) joins Santa's sleigh team, unaware that jealous Blitzen (Hugh Grant) is plotting against him. Donner: Britney Spears. Prancer: Brad Garrett. Santa: Jim Belushi. Old Jingle: Jerry Stiller. Vixen: Leah Remini. Des Yeti: Dick Enberg. Alan the Snowman: Dan Dierdorf.