Castaway: Redemption Island

 is the ninth season of Castaway and was produced on March 7, 2021.

The season borrowed elements from the CBS reality television competition Survivor. Hosted by Robert, it consisted of eighteen returning competitors and the second season to feature a cast consisting entirely of returning competitors following Castaway: Cambodia.

The two tribes, Ometepe and Zapatera, were named after an island and volcano located in Nicaragua respectively. When fourteen competitors remained, the tribes swapped into two tribes of seven. When eleven competitors remained, the tribes merged to the Segundo tribe named by Andrew, the Portuguese word for "second". Dylan won the season over JD and Renzo in a 3-2-2 vote.

The season premieres its namesake, Redemption Island, inspired by a concept used in several international franchises of Survivor. Several twists such as Exile Island and Trial by Fire were incorporated into the season though under different formats revolving around Redemption Island.

Redemption Island and Casting
This season introduced "Redemption Island" to Castaway, based in part on concepts already used in the American versions in Survivor and a twist introduced in Castaway: One World, Trial by Fire. Unlike other adaptations of Redemption Island, when a castaway is voted out they will choose a player from their former tribe for their spot in the game. The winner remains in the game whilst the loser exits the game permanently. However, if a castaway is eliminated after a tie-vote or rock draw, they do not attend Redemption Island and exit the game permanently, this new rule dubbed the "Redemption Rule" was introduced in an attempt to cause more split votes regardless of a hidden immunity idol and not have a majority alliance dictate the flow of one tribe. Duels are scaled back versions of challenges used in previous seasons of Castaway.

The season was initially planned for new players to the series with an emphasis on redeeming themselves from other series within the social strategy gaming community, but not utilising duels. After the huge response in casting for Castaway: Cambodia — All-Stars the casting changed to returning players once again, with the focus on returning who had incomplete story arcs as opposed to audience favourites.

Casting for the season was not held through the typical application process, instead using the existing All-Stars pool alongside reaching out to those the host believed would be a good fit for the theme.

Voting and Redemption Island History
Duels are denoted by the cell.