Codename: Kids Next Door, Season 2

Numbuh 5:
[narrating] But everybody knows that there are three elemental, pure flavors of ice cream: Smooth, creamy vanilla. Rich, decadent chocolate. And sweet, sweet strawberry. But a long time ago, there was a fourth flavor, and it was said to be better than the other three combined. When the Sacred Sect of Dessert Monks created this mystical fourth flavor, they were afraid that everyone would like it so much, that they would eat it all up until there wouldn't be and left for them. So they locked it away. Only the true ice cream lover could have so much as a taste of the fourth flavor, and then, only if they proved themselves worthy by solving the riddle of the Mystical Golden Scoop. [telling a group of kids the backstory legend while visiting a museum] No one knows where the monks locked away the fourth flavor, and few still believe it exists. So the Golden Scoop remains, waiting for the one with the sweet knowledge of frosty goodness to claim the fourth flavor as their own.