The team is looking for a missing Greek treasure tied to an old friend of Judson's, Penny, who went to a small island seeking the Oracle's Treasure and fell ill to hallucinations with only days before she dies. The gang travel to the island and must deal with the secretive locals. Gabe gets drugged by an attractive woman and thrown off a cliff while Judson and Mac negotiate with Stavros, who claims to be the voice for the Gods. The local families have the treasure and are trying to sell it off and stop the team, who search the island and Judson finds the caves. Then he's plagued by hallucinations of Greek hoplites that the others realize is caused by a fungus and get him cleaned off in time. The Greek family attack and they're forced to take refuge in the cave. Creating makeshift filters, the gang finds the treasure and another way out – Mac creates a distraction so the others can get out and get the upper hand, and get the fungus sample to the doctor to cure Penny.