In the series premiere, four military heroes meet the 16 men and women who will face several tough military and survival challenges throughout the series.

The next challenge is revealed and the losing teams must send one team member to compete in "The Circus."

The next evolution is revealed and forces the competitors to think on their feet as they break down and set up camp.

Memorization is tested in the next evolution as the competitors must memorize and recreate a specific set of symbols.

Survival skills, decision making and teamwork are tested as the contestants create shelter, purify water and build a fire in their next challenge.

The competitors face a test of strategy and teamwork as they are challenged to cross a 60-yard field without touching the ground with their feet.

A surprise evolution awaits the remaining contestants, who need to be ready to go at any time. Later: they are led to a secret location and challenged to navigate through a series of check points while the cadre leaders sit out.

The teams battle in capture the flag, where the winner is safe from "The Circus" and gets a surprise visit from a family member.

In the Season 1 finale, the final teams tackle four grueling obstacles before taking on the final evolution challenge, in which they must suspend themselves upside-down above a waterfall and cross a wire. Later: they enter "The Circus" for the final time, but will have to run it twice to complete it.