It seems during a duel monster's tournament, a group called the Little Legends appeared in town. They have a mystic card for their duels, The Seal of Crinkle.

When this card is activated, the duel area gets transformed in a playpen. and as the duelists loose their life points, they start to fit in the place they're now. The looser gets trapped in this zone, and everyone else see him as a little toddler.

Gus got into one of these duels, but things aren't going good for him. Once he lost half of his life points, his clothes vanished, and his underwear changed into pullups. in 2000, his underwear changed in a babysh diaper

His life points won't hold too much, unless he can figure out a way to escape from this magic, or a way to win this duel.

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just found a channel on tv that shows yugioh, the season from that kaiba tournament with marik. But one of my favorite seasons it's the orichalcum's seal... so..yeah, ya might have seen the ref from this pic here xD