Adam Klein (Survivor contestant)

While his mother was sick with cancer, Klein accepted his invitation for Survivor: Millennials vs. Gen X, the show's 33rd season. As part of the original Vanua tribe, composed entirely of millennials, the 25-year-old survived the first four eliminations to make the Tribal Split on day 13, which distributed the remaining castaways across three new tribes. On day 9, he had discovered a hidden immunity idol at the Millennials camp. He was moved to Takali, formerly the tribe consisting entirely of Generation X members. There, he provided the swing vote on Night 18 that broke up the alliance/romance of Taylor Stocker and Jessica "Figgy" Figueroa, by sending Figueroa out of the game.

Klein made it to the merge on day 21 and became part of the new Vinaka tribe. That same day, he found an advantage in the game which gave him the ability to steal another player's reward. He confided information about this advantage to Stocker, in an effort to win the latter's trust. In return, Stocker admitted that he had been secretly stashing food in a container underneath the sand. Klein and Stocker agreed to keep each other's secrets, while Klein urged Stocker to vote out Will Wahl at the next Tribal Council. But Stocker, still upset over the blindside of Figueroa, told Justin "Jay" Starrett, Klein's main rival, about the plan to target Wahl. Starrett then told Wahl, and the two of them, along with Stocker and Michelle Schubert, plotted to vote out Klein at the next Tribal. After Wahl won immunity on day 23, Klein and his allies, Hannah Shapiro and Zeke Smith decided to join the Gen X faction in voting out Schubert. That night, Klein received four votes, but the other nine went against Schubert. At the next Tribal Council on Night 25, Stocker revealed both his and Klein's secrets and insinuated that Klein had also eaten some of the stashed food. Klein refuted that claim while admitting to having a game advantage. Stocker, on the other hand, was eliminated on a 7–4–1 vote.

On day 31, the surviving castaways were paid a visit by their loved ones. Klein's brother Evan was one of them. Before the challenge, Klein told everyone the details of his advantage but promised not to use it to take another player away from a loved one. The challenge would be won by Starrett, who allowed Klein and his brother to join on the reward, despite the fact that Starrett was Klein's main rival in the game. During the reward, a BBQ lunch, Klein was informed by his brother of their mother's condition and learned that doctors had stopped all treatment after her body failed to respond positively to it. Later on, Klein spoke about his mother's condition to Starrett, then thanked Starrett for the lunch by giving him the reward advantage. In return, when Starrett finally used the advantage to steal a reward from David Wright on day 36, Starrett invited Klein and Wright to join in on that reward.

By day 38, with only four players remaining, Klein had once again become a target. But he teamed up with Shapiro in a plan to target Wright. In the process, Klein managed to convince Wright's ally Ken McNickle to vote against Wright, who was seen as a big threat to win the game. By the end of the night, Klein had survived to become one of the three finalists alongside Shapiro and McNickle. At the Final Tribal Council, when the jury grilled the finalists as to why they deserved to win, former Gen X tribe member Chris Hammons praised Klein for doing whatever it took to eliminate Wright at the Final Four when the others had failed—although McNickle would claim that it was his decision alone to vote out Wright. For the final question of the night, Wright asked all three finalists about growth and transformation in the game of Survivor. Klein, in his response, finally revealed to the entire jury his mother's condition, and how she had motivated him to win.

After Survivor wrapped production for the season, Klein immediately rushed home to be with his mother. He made it home just in time to see her before she died an hour after his arrival.[8] On December 14, 2016, it was announced, at the live Survivor finale, that he had received all ten jury votes to win the $1 million and the title of Sole Survivor, making him only the fifth unanimous winner in Survivor history, joining Earl Cole, J. T. Thomas, John Cochran, and Jeremy Collins. After talking about his mother's death on the live reunion show, he pledged to donate $100,000 of his winnings to Stand Up to Cancer,[5][7] a charitable program that aims to raise significant funds for translational cancer research through online and televised efforts.

Klein competed again on the show's 40th season, Survivor: Winners at War.[9][10] He immediately bonded with Denise Stapley when the two went off to find the well. While this made them potential targets going into the season's first Tribal Council, he escaped elimination and helped organize Natalie Anderson's elimination. On day 9, he became a target after leaking to Rob Mariano a plan to vote out Parvati Shallow. That night he received three votes from Mariano, Shallow and Ethan Zohn, but narrowly escaped elimination when Michele Fitzgerald, Ben Driebergen, Jeremy Collins, and Stapley voted out Zohn. When the Tribe Switch occurred, Klein was moved to the Yara tribe along with Driebergen and Mariano. While Adam had the numerical advantage, both he and Driebergen flipped on Mariano and blindsided him at Tribal Council on night 14.

Klein reached the merge. At the merged Tribal Council, Klein received three votes from Fitzgerald, Wendell Holland and Nick Wilson, but was spared when the rest sided with him and blindsided Holland. Despite surviving, he was still a big target. On night 23, he attempted to make a last-ditch effort to save himself by attempting to play the voting podium symbol, believing it to be an idol, but he was wrong and subsequently voted out. He failed to win the second re-entry challenge and finished in 12th place.

At the final tribal council, Klein along with eleven other jury members voted for Tony Vlachos to win.