- While The Professor tries to round up enough metal to make an anchor for a raft with an S.O.S. message attached to it, Gilligan reels in a World War II underwater mine from the lagoon.
- The Professor (Russell Johnson) and the Skipper (Alan Hale Jr) are building a raft with a time-release anchor to get them rescued, and everyone is donating all unnecessary metal to melt down for it. While fishing in the Lagoon, Gilligan (Bob Denver) catches and reels in an old World War Two Mine. He tries to tell the Skipper, who doesn't have time to listen to him. However, when he tells the Howells, Mr. Howell (Jim Backus) misunderstands and thinks Gilligan has found an iron ore mine, going into a partnership with him over it. Meanwhile, the Professor is running out of metal to make the anchor for the raft. Ginger (Tina Louise) has a gold mesh pocketbook to donate and Mary Ann (Dawn Wells) has a gold slave bracelet that turned her wrist green. When she checks on Gilligan, he has surrendered all of his unnecessary metal except his prized heirloom solid gold lucky charm, which he refuses to relinquish to her. When Mary Ann tells Ginger, she tries to sneak it off him, but Gilligan magically gets it back. Meanwhile, the Professor still doesn't have enough metal for the anchor, and Gilligan tells him about the mine. No one believes him so he takes them to see the mine in the lagoon. Once the realize what it is, the Professor discovers its ticking, panicking Gilligan who runs screaming through the island. The Professor reveals that because the island is built of coral and volcanic ash that the mine could set off a chain reaction through the subterranean underground gases that could blow up the island. The Professor tries deactivating the mine, but its interior is so rusted that it can't be deactivated. Their only recourse is to carry it out to sea and away from the island. As they're drawing straws, Gilligan eavesdrops, and believing it's all his fault, he runs to the lagoon to take the mine out to sea, but he forgets about the metal on the raft to which the mine is attracted. The Skipper and Professor find him paddling at forty knots through the lagoon with the mine following behind him, eventually losing it at the last second as the mine drifts out of the lagoon. Several moments later, everyone is cheering Gilligan's bravery, but the tide brings the mine back into the lagoon where it explodes, sending a shower of fish over everyone and allowing Gilligan to catch a swordfish for dinner.
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