If you haven't seen it, it is a series similar to Man Vs Wild and Survivor Man, but they have 2 people trying to survive instead of just 1. Season 1 and 2 starred Cody Lundin (a naturist who doesn't usually wear shoes) and Dave Canterbury (a military-trained survival instructor). This season Canterbury is being replaced by Joseph Teti, a former Green Beret. Not sure why Canterbury is out, I liked how he offset Lundin. Maybe he got tired of dealing with Cody. Anyways the first two episodes air back-to-back tonight on Discovery: The season opener, a one-hour special entitled “Unbraided”, features never-before season footage of Lundin, who introduces audiences to his new cohort, and gives fans a glimpse into what to expect from the pair. The premiere is followed by “Mars on Earth,” which takes the two to the driest place on earth. Chile’s Atacama desert, which NASA uses as a testing ground for its Martian rovers.