No one can resist smiling at these houses a-dazzle with twinkling lights and decked with flying reindeer, jolly snowmen, inflatable Santas, plastic sleighs--and every other sign that hearts are overflowing with Christmas cheer. It's become a holiday tradition around the globe to drive through the neighborhood to look at these extravagantly decorated homes. "Planet Christmas" offers a world tour of the best and the brightest, from Auckland, New Zealand, where the Ballentine family pumps clouds of artificial snow off their balcony, to Peters Township, PA, where sightseers view Santa and Mrs. Claus presiding over a Santa's Workshop 50 yards wide.