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

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.

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

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

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

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

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

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

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

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

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