With the help of a curmudgeonly hermit, a bratty young boy named Snively schemes to scare away guests and undermine the annual Christmas carnival at his aunt's resort in scenic Jellystone National Park. Roused from peaceful hibernation by noisy revelers, a frazzled Yogi Bear (Daws Butler) and his trusty sidekick, Boo Boo (Don Messick), investigate, eventually joining in the festivities -- much to the chagrin of Yogi's erstwhile arch rival, Ranger Smith (also Messick).