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The Mysterious Duo (不思議なふたり, Fushigi na Futari; lit. "Mysterious Duo") is the four hundred thirty-seventh chapter of the Dragon Ball manga.
With the Junior Division of the World Martial Arts Tournament concluded, the Z-Fighters return to the staging area to get ready for the Adult Division. While this is going on, Trunks comes up with a way to get himself and Goten into the Adult Division; they knock out another fighter, Mighty Mask, then stack up so they can wear his costume.
Goku, Vegeta, and Krillin are having some food before before the tournament begins. Krillin is amazed that Goku can still eat so much, considering he's dead. Gohan and Videl join them later. then after they finish eating, they head for the lottery draw.
While on the way, they notice two strange beings. The smaller one recognizes Goku and states that he's heard about him and has always wanted to spar with him. They shake hands, to which the smaller being notes Goku has a good soul. They head off, and Piccolo asks Goku who that was, to which Goku responds he has no idea, but feels that making a clean sweep of the tournament has become a lot harder.