Heather needs to move camp, but the grueling trek could break Andrew.

Heather, Andrew and Patrick scavenge debris to make fire; Candice secures a protein win; Bulent and Na'im butt heads when their pig snare fails, and Kerra is caught in the middle; a survivalist is medically evacuated off the island.

Medics intervene when a survivalist consumes toxic fruit.

After an emotional reunion, Na'im vows to get Rachel to day 21; a group must migrate through a croc-infested swamp; Bulent finally comes nose-to-snout with the elusive pig he's been hunting; a survivalist is forced out of the challenge.

Bulent struggles with uninvited guests and scrambles to protect his huge meat win; a water migration tests Na'im, Kerra and Justin's raft -- and a mysterious fever puts their challenge at risk; the groups join forces to push north for extraction.

To be rescued, the remaining castaways must hike across jagged, volcanic rock and crumbling cliffs, build a large signal fire, and construct a raft from driftwood and debris; an explosive fight between Na'im and Patrick threatens extraction.