After a grueling finish, the top three teams of Alone's fourth season reunite to discuss their unique adventures and reveal never before seen moments.

As time presses on and temperatures drop, the final teams grapple with an unbearable desire to tap out. But the $500,000 prize is hard to give up, and the participants push themselves until one reaches the breaking point.

As freezing temperatures punish Vancouver Island, the remaining pairs all face game-changing scenarios. One participant is hit with a crippling illness, while another's temper drives a wedge between him and his teammate.

After nearly a month on Vancouver Island, the three remaining teams face existential threats at every turn. One participant is forced to fight a raging fire, while rising tensions threaten to end another partnership.

The three remaining teams scramble for a long term advantage. One pair runs themselves ragged with an elaborate shelter build, while another hazards the freezing Pacific waters on their own small craft.

As Vancouver Island is pummeled by torrential rains, the remaining teams scramble to avoid freezing flood waters. One team attempts a massive construction project that could be their key to survival, while another must choose between betraying family and tapping out.

Now that most teams are reunited, they dive into the difficult task of surviving together and feeding two people. Meanwhile, the final hiker faces a brutal mountain climb that could dash his hopes of ever making it to camp.

Desperation sinks in as the hikers struggle to make the final push to their teammates. Exhaustion leads one participant straight into the path of a predator, and into a dangerous confrontation.

On Vancouver Island, a seriously injured participant weighs the risks of seeking medical help and sacrificing his shot at $500,000. Danger awaits all participants as predators continue to stalk the island's newest inhabitants.

As their teammates attempt to set up camp, the hikers find that Vancouver Island's terrain is even more punishing when on the move; the island beats one pair into submission, while another grapples with a devastating accident.

Family members are dropped off miles apart and must navigate the unforgiving terrain of Northern Vancouver Island to find each other; to win the $500,000 prize, the competitors must build their own shelters and forage for their own food.

A behind-the-scenes look at season four of the series, "Alone,'' during which seven pairs of family members are dropped off miles apart on Northern Vancouver Island; an introduction to the teams includes analysis of what it takes to make the cut.