When sparks don't fly deep in Panama's Isla San José, an ex-cop Gary Underhill and a "wild child" Kim Kelly clash over cuddling.

Trent Nielsen and Annie Foley are afraid of the dark in the mysterious Mayan jungles of Belize.

Mountaineer Joe Brandl and former cop Andrea Lopez survive in Namibia, which is home to dangerous predators, but inner demons seem to cause more trouble.

Tara Skubella and Dustin Hobbs must endure the jungles of Panama's Isla San José, where disease-carrying insects may prove to be the team's greatest threat.