After a road accident caused by Marge results in the height of the Springfield Tire Fire increasing, the snow on Mount Springfield begins to melt, uncovering a frozen mailman from 1966. His mail is delivered, including a letter from Mona Simpson uncovering a secret affair and putting a question mark over the identity of Homer's true father. Homer tracks down the man from the letter, Mason, who invites he and his family onto his private ship. The family love him, but Abe feels betrayed. After a DNA test it is revealed that Mason is Homer's father. Mason takes Homer on an underwater treasure hunt, but when Homer is caught in coral and comes close to death, he remembers the fun times he had with Grampa. In hospital, Grampa reveals that he is his real father because he switched the DNA samples after he saw how happy he was with Mason.
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