(Enhanced; 4-hour episode.) Thanksgiving is the one night a year Americans celebrate by eating the same meal across the country. But 100 years ago, some of the biggest staples of Thanksgiving Dinner weren't around. Gilbert Swanson inherits his father's frozen turkey company and partners with a food chemist to innovate a revolutionary dinner that Americans can heat up at home... they call it the TV Dinner. The top selling candy days of the year revolve around Easter, Valentine's Day and Halloween. And it all started with a few bold pioneers. Santa Claus is one of the most beloved figures--and famous faces--on Earth. But how did this third-century saint become the Santa we know today?