Dual Survival is a United States reality television series that airs on the Discovery Channel. The show features a pair of survival experts in predetermined survival scenarios while in challenging environments.For the first two seasons, the show featured the differing outdoor survival philosophies and skills of Cody Lundin, a naturalist and primitive-skills expert who runs the Aboriginal Living Skills School in Prescott, Arizona, and Dave Canterbury, a military-trained survival instructor who runs the Pathfinder Training School in Ohio. Beginning with the third season, Canterbury was replaced with Joseph "Joe" Teti, and in Season 4, Matt Graham replaced Lundin; Teti and Graham remained with the show through Season 6. Season 7 features Grady Powell, an ex-U.S. Army Green Beret, who replaced Joseph Teti, and Bill McConnell, a wilderness survivalist, who replaced Matt Graham. Season 8 Bill McConnell is replaced by Josh James for all but the last 2 episodes of the season where Josh James is replaced by Airforce veteran Bo Mcglone. In Season 9 both Grady and Bo are replaced by Naked and Afraid stars E.J. and Jeff.