Castaway: Edge of Extinction

 is the thirteenth season of Castaway and was produced on July 11, 2021.

The season borrowed elements from the CBS reality television competition Survivor. Hosted by Robert, the game consisted of thirteen new competitors and six returning competitors from previous Castaway seasons.

The three tribes, Kama, Lesu, and Manu were named after the Fijian words for "to burn", "to return" and "bird" respectively. When fifteen competitors remained, the tribes swapped into three tribes of five. When eleven competitors remained, Logan won the first re-entry competition as they merged to the Wai tribe named by Khalid which is the Fijian word for water. When four competitors remained, Connor won the second re-entry competition. Ben won the season over Connor and Danielle in a 4-3-2 vote.

The season premieres its namesake, Edge of Extinction, inspired by a concept used the American franchise of Survivor that features the opportunity for eliminated players to return to the main game at various points. The season reintroduced the team twist at the merge, but as opposed to winning immunity as a team, one competitor from each team would win Individual Immunity and both teams would eliminate one competitor each. The Final Four elimination challenge also made its third appearance since its introduction in Castaway: Micronesia.

Edge of Extinction and Casting
This season introduced "Edge of Extinction" to Castaway, based on the thirty-eighth season of the American franchise Survivor: Edge of Extinction wherein competitors who are voted out have an option to go to the "Edge of Extinction" rather than leave the game permanently.

Competitors on the Edge of Extinction may either wait for an opportunity to re-join the main game or may choose to leave the game at any point informing the host before the start of the next Immunity Challenge. At designated points in the game, the remaining Edge of Extinction castaways compete in a challenge with the winner returning to the game and the Edge of Extinction castaways eliminated. The twist then resets at the tribe merge.

A twist to the Edge of Extinction is that at Tribal Council a player can voluntarily go to the Edge by "Raising the Flag" in return for an advantage in the re-entry competition. The host announces before the vote if anyone would volunteer, if after five seconds nobody volunteers, the vote goes ahead as planned.

Due to the size of the cast and the number of players at the merge, the jury expanded in size by two additional members bringing the total number of jury members to nine as opposed to previous seasons that had only seven.

Castaways
Due to an uneven cast size, the opening challenge gave Khalid, the winner of the first heat, an advantage of having one extra member on Kama. Isaiah won the second heat and chose their preferred tribe of six for Lesu, leaving the remaining unchosen six to form the third tribe, Manu.