CBS is about to launch the 38th edition of its competition series “Survivor,” which will be themed “Survivor: Edge of Extinction.”

The show, which premieres Wednesday, Feb. 20, will feature 18 castaways, who will be divided into the Manu Tribe and the Kama Tribe.

Four of the castaways will be returning after previous “Survivor” appearances: Joe Anglim (“Worlds Apart,” “Second Chance”), Aubry Bracco (“Kaoh Rong,” “Game Changers”), Kelley Wentworth (“Second Chance,” “San Juan del Sur”) and David Wright (“Millennials vs. Gen-X”).

“This season presents a new layer to the game with the introduction of the island known as ‘Edge of Extinction,’ which severely tests the will of the castaways to be the Sole Survivor and what they are willing to endure to make that happen,” CBS says in today’s announcement. “Those who can withstand the emotionally and physically difficult challenge will be afforded a shot for one of them to get back in the game and continue their quest for $1 million.”

Click here for details about all of the competitors, along with the cast photo for the Kama Tribe.

Manu Tribe, “Survivor: Edge of Extinction” (CBS)