It's the most wonderful time of the year. The Martin, Horn and Vistalli families go head-to-head for the most spectacular holiday displays in hopes of earning the $50,000 grand prize and "Light Fight" trophy as Carter Oosterhouse judges. 

In the final showdown of the season, the Loder, Perez and Plourde families share their versions of winter wonderlands with judge Taniya Nayak in hopes of winning the $50,000 grand prize and "Light Fight" trophy.