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Three former castaways, who were pulled from the game for medical reasons, have returned to compete in the 25th season of Survivor, and on tonight's all-new episode, it looks like illness is about to claim one more victim!

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With the Matsing Tribe losing every Immunity Challenge thus far, both Kalabaw and Tandang have had an easy run thus far. But when Jeff Probst calls in the Survivor medics to examine an ailing member from Kalabaw, the decision to stay or go is placed in their hands!

Survivor airs Wednesdays at 8 p.m. on CBS.