Winners battle it out, but only one is crowned Sole Survivor and takes home the $2 million prize.

Twenty winners of "Survivor" return to compete against one another for a prize of $2 million.

Alliances threaten to crumble; an undercover operation escalates to new heights.

The immunity challenge weighs heavily on castaways when two tribes are sent to tribal council.

Things get tense for the castaways during a chaotic tribal council; a taxing immunity challenge.

Alliances threaten to crumble; an undercover operation escalates to new heights.

One castaway is out for blood after realizing an ally was sent to the Edge of Extinction.

The remaining seven castaways make their final push toward the $2 million prize.

With the old-school players living on Edge of Extinction, it’s merge time for the new-school castaways.

Contestants have moments with their loved ones; the 12th person is sent to the Edge of Extinction.

New-school players attempt to take control against the old-school players.

Castaways are on the edge of breaking down when faced with a grueling opportunity.

Tribes drop their buffs and switch things up; tension in one tribe creates alliance opportunities.

Some winners sprint their way to an opportunity to gain an edge over the other castaways.