The day after Pagong voted out Joel Klug, one person from each tribe went to the opposite tribe's camp and would then convene to decide which beach to live on. Jenna Lewis went to Tagi and Sean Kenniff went to Pagong. After a bit of time at camp, Jenna and Sean met with each other at a neutral site to decide which beach they wanted to live on and what to name the newly merged tribe. They were welcomed by a feast, including lobster and wine, and got to stay the night under a canopy shelter and on beds. The next day, Jenna and Sean decided to live at the Tagi beach and named their merged tribe Rattana. The ten castaways met up and everyone celebrated, except Rudy Boesch, who was annoyed because the population doubled.
On Day 21, Greg Buis won the first post-merge Immunity Challenge after a close battle with Sean. At Tribal Council, the disorganized Pagong tribe and Sean were completely split and voted individually, while the Tagi Alliance of Kelly Wiglesworth, Richard Hatch, Rudy, and Susan Hawk stayed together and voted out Gretchen Cordy. At camp, the remaining members of the former Pagong tribe felt vulnerable because the Tagi tribe voted out their leader, Gretchen. Jenna decided her best move if she was to survive was to get closer to the other women, all of which were Tagi members. Jenna put her plan into action and seemed to sway Susan, who at first thought Jenna was going to be really annoying. Richard started to worry about who voted for him at the previous Tribal Council.
At the Reward Challenge, host Jeff Probst showed everyone a sneak peek at the reward except for Jenna because the Survivor Production Team never received a video for Jenna. Greg went first and no one hit the mark closer, so he won the reward and saw his home video from his sister and sent one back to her. Rudy thought there might be some incestual behavior between Greg and his sister though clearly took things the wrong way. Jenna was frustrated about losing the Reward Challenge and instead of watching Greg's video, continued to practice with the bow and arrow, continually hitting the target closer than Greg's mark. People began to realize that Richard liked Greg because of the way he was playing the game, while Greg realized that Richard was a powerful player in this game. Gervase Peterson then won the next Immunity Challenge on Day 24. At Tribal Council, the Tagi Alliance and Jenna piggy-backed off of Sean's alphabet strategy and voted out Greg.
While Richard was catching fish, the other players began to realize that nobody voted him out because of his role as provider. Rudy did not make the fire hot enough, so the fish was not done when it got off the fire, and the attempt to recook it merely burnt it. The Reward Challenge was a race between Colleen Haskell and Kelly, which Colleen narrowly won. When Colleen won, Jeff told her she could pick one other person and she instantly chose Jenna. Day 27 was Richard's 39th birthday and he celebrated in his "birthday suit". Richard spent his entire birthday naked, which disturbed some of his tribemates, especially Colleen and Jenna.
After Rudy won immunity over Sean, Sean was convinced that his alphabet strategy of voting for people was the fairest way and that there was no alliance because he was not asked to be a part of it. He continued to vote that way and even told Jenna beforehand that he was voting for her but that he did not think it would make a difference. At Tribal Council he was once again proven wrong, as Richard, Rudy, and Sue again piggy-backed off his vote and Jenna was voted out.
Some people were happy that Jenna was voted out because she was getting on everyone's nerves. Everyone knew that Sean voted for Jenna and that Kelly did not, so the remainder of the Tagi Alliance felt betrayed. The alliance thought about replacing Kelly with Sean because he might have been more valuable. Richard's plan was to catch more fish once Colleen and Gervase were gone. At Tree Mail, the castaways were surprised by cigars and a note saying that Gervase's son, Gunnar, was born the day prior, which they celebrated. Gervase then narrowly beat Richard at the Reward Challenge and had a chance to call his girlfriend and daughter to see how his baby was doing. He shared his slice of pizza with everyone. While he was making his phone call, Rudy questioned Gervase's life choices, namely having four children out of wedlock, and said that having babies out of wedlock would have never happened when he was Gervase's age and that the girl would be "taken out of town" and dealt with. At the Immunity Challenge on Day 30, Richard easily won. At Tribal Council, the five Tagi members decided that Gervase was a bigger threat than Colleen, voting him out. Ultimately Kelly decided to vote with her alliance despite her urges to join forces with the others.
The Tagi Alliance began to crumble because Kelly was always talking to the remaining enemy of the alliance, Colleen. Sean won the next Reward Challenge and was surprised to see his dad on the yacht. Sean told Kelly he was going to take her for the feast, but chose Richard instead, which infuriated the women. Sean brought his dad back to camp to meet everyone, who attempted to update them on current events and the stock market, although Sue thought he did not know anything, and before he left, he gave each person a care package from their loved ones, which rejuvenated their spirits. At the Immunity Challenge on Day 33, Rudy fell off first. Richard attempted to annoy people off the planks by singing "99 bottles of beer on the wall" until he fell off. On the beach, Richard thought it was funny that Colleen was really trying to win immunity when she had no chance of going home that night because they were going to blindside Kelly. Sean was third to go, followed almost immediately by Sue. Colleen fell off after 2 hours and 54 minutes, giving immunity to Kelly and foiling the Tagi Alliance's plans. At Tribal Council, Sean was grilled for taking Richard on the reward instead of Kelly. Colleen, the last remaining member of Pagong, was voted out.
With only Tagi tribe members left, the two people that felt vulnerable were Kelly and Sean. Kelly mentioned that she did not trust Richard, while Richard conspired to get Kelly out next. Sean thought he was stuck with the most conniving people ever. Tempers flared at camp as Kelly and Sue had a fight about their alliance since Kelly did not vote with them again, and Sue said that Kelly made them all look like idiots. Richard attempted to smooth things over, although he said that the fight played to his advantage. Sue got stung by a ray and her hand swelled up.
After Kelly won the next Reward Challenge, Kelly and Sue rekindled their friendship. Kelly went with Jeff to watch the first 5 minutes of the first episode and talked to Jeff about how the game was going for her. On Day 36, Kelly and Sue agreed to keep civil with each other, although Sue told Kelly she did not want her in the final three because she was such a threat. Sean knew he needed to win immunity and attempted to exploit the Kelly-Sue friendship. However, Kelly won her third challenge in a row. Richard tried to decide whether he would be voting for Rudy or Sean, although Rudy was confident that it would be him and Richard in the Final Two. While everyone spoke of voting for different people, in the end, the original Tagi Alliance stuck together and Sean was voted out.
On Day 37, the final four reflected on how much their bodies have changed, and how the game was played by them and by others. Kelly said she felt like the odd person out and was stressed because she did not feel safe. She said that she was now playing for herself. Richard, Rudy, and Sue were planning to vote out Kelly if she did not win immunity. At the Immunity Challenge, Kelly and Sue were tied after 10 questions, but Kelly got the tiebreaker question correct, giving Kelly her fourth challenge win and third immunity in a row. Directly afterwards at Tribal Council, there was a 2–2 tie between Richard and Sue. During the revote in which only Kelly and Rudy voted, Kelly changed her vote and Sue was voted out.
At 4:00 am on Day 38, the remaining three were awoken by Jeff, who told to put on something comfortable, and took a long boat ride to their Rites of Passage and Final Immunity Challenge. For their Rites of Passage, they covered themselves with mud, walked through palm fronds held by locals, passed the torches of their fallen comrades, then passed through a bamboo curtain and walked barefoot through a fire pit.
At the Final Immunity Challenge, after two hours of holding on the idol, Jeff tempted the three with oranges. After 2 and a half hours, Richard gave a speech, said he would not be able to outlast Kelly, and stepped down voluntarily. He stated that it was a game of odds and he did not know what the winner would actually do. After three hours, the two left switched positions while keeping their hand on the idol and were to do so every half-hour. While the two were still standing on the pole, Richard addressed the alliance to Jeff and how he was not surprised that Kelly changed her vote. After 4 hours and 11 minutes, Rudy took his hand off the idol while switching spots, and Kelly won immunity yet again. Richard and Rudy both said it was in Kelly's best interest to keep themselves. At Tribal Council, Kelly voted out Rudy because she thought she might have a better chance of winning against Richard.
At the Final Tribal Council, Gervase asked if there was one, two, or three things they would change about their time on the island if anything at all. Richard said trusting people so easily, Kelly said making an alliance. Jenna asked who they would put in the Final Two and why. Richard said Rudy and Greg; Kelly said Sonja Christopher and Gretchen. Sean had no questions, but congratulated the two and thanked Kelly for being capable and keeping camp afloat, and told Richard that he enjoyed his company although he played the game differently. Colleen asked what three character traits got them to where they are and are essential to get future players to the finals; Kelly said faith, strong will, and likability, while Richard said self-awareness, observation of relationships, and ethics. Rudy said he had nothing to say to them two, but felt dumb after mistakenly removing his hand in the Final Immunity Challenge. Greg had them choose a number between 1 and 10 (Richard said 7; Kelly 3). Sue famously compared Richard to a snake and Kelly to a rat and declared her intent to vote for Richard. In the end, Rudy, Sue, Sean, and Greg voted for Richard; Jenna, Gervase, and Colleen voted for Kelly. With that, Richard Hatch became Survivor's first millionaire by a vote of 4–3.
- Rattana is the first merged tribe in the history of Survivor.
- Rattana is the only merged tribe to paint the Survivor logo on their flag manually.
- Rattana is the first ever green tribe in Survivor.
- Rattana is one of three merged tribes to have its final four all eventually return in future seasons, along with Gitanos and Solarrion.