Nikki gets into the Yuletide spirit and prepares her annual Christmas tree-trimming party, but everyone turns her invitations down flat. To lift her spirits, she visits the mall to do her last-minute shopping. When the Santa Claus at the mall suddenly deserts the anxious children waiting to have their pictures taken, Nikki seizes the moment by pretending to be Santa. Just as the mall begins to close, Nikki, Kim, Andell, Stevie, T and Professor Oglevee all end up locked in the department store after being coaxed by a strange man named Walter. Nikki tries to cheer everybody up, but they all seem bothered and grumpy. After a hectic "Secret Santa" gift exchange, Nikki becomes upset with everyone's bickering. Realizing how childish they have become, everyone gathers around Nikki and apologize. When the security guard comes to the rescue, Nikki reveals a description of Walter, but it turns out that no one by that name is employed at the mall. The next day, everyone exchanges gifts. Nikki receives an anonymous gift. But as sleigh bells are heard only by her, she soon realizes who her secret Santa is.