The last three models standing must be on point for the most important commercial and photo shoot yet. The two models that shine at the shoot will remain and compete in a pivotal runway show for the judges. The final two glide down a cavernous catwalk in couture bridal gowns like true top models. But it's not all beauty, for at one point during the show a mishap occurs between the competitors, causing one last catfight to erupt.

Christmas comes once a year but not on MythBusters! Is it really true that leaving some Christmas lights on your tree overnight could cause it to heat up so much that the tree bursts into a ball of flame? Meanwhile, Kari, Grant and Tori investigate a frontier technology that if confirmed would take off in a big way. Anti-gravity is the holy grail of science. But is it science or science fiction? With a flick of a switch can you simply turn off gravity? And if that wasn't enough, in "Vodka Jellyfish," Kari puts her life on the line with a final shot at a vodka myth. Is it true that vodka can cure the pain of a jellyfish sting? There are screams, torture and tentacles! .

Holiday Themed Myths. Can the Mythbusters really make a 35-piece Goldberg machine work, or will they just get frustrated and call it quits? What will keep your tree from dropping needles, bleach or hairspray? Will the turkey kill the dog? Tune-in and see it for yourself.

Original Pilot of the hit BBC Panel Show.

Out-takes and extra bits from Series 1 (A) of the BBC Panel Show.

Bob, Kim, and season 2 winner Matt Hoover head over to their high schools to teach the kids about childhood obesity, proper exercise, and nutrition. Meanwhile, Bob and Kim talk to the school lunch ladies about replacing the unhealthy food options with healthier ones. They will attempt to inspire the kids to change their unhealthy lifestyles and educate their families.

It's the final week at the ranch, and the remaining contestants prepare to return home. They will try to take what they've learned at the ranch and apply it to their every day lives to continue losing weight on their own.

Tonight Stephen welcomes the president of New York University, John Sexton.

This round's theme is all about working with limitations. The contestants must create a dish that is not cooked, and then adapt when they're asked to plan a dish without knowing the kitchen equipment available to them. Guest Judge: Raphael Lunetta QuickFire Challenge: Create an Entree Using Only Raw Food Without any Cooking. Elimination Challenge: Create a Gourmet Breakfast for Mystery Athletes.