Claire & Darth

The episode features 19-year-old Claire Wineland from Venice Beach, Calif. Claire has cystic fibrosis and founded Claire's Place Foundation, Inc., a non-profit providing support to the children and families affected by the disease. Also featured in the episode is "Darth Vader" from Canandaigua, N.Y., who has been battling leukemia for the last 14 years. With 13 surgeries as part of his history, Darth has still managed to complete more than 50 Tough Mudder competitions, as well as 37 half-marathons.