It was so delicious, that most people were deemed unworthy to taste it, so it was hidden away. A golden jewel encrested scooper served as a key to obtaining the Fourth Flavor.
The way to the Fourth Flavor was riddled with traps including a riddle that had to be answered correctly or you would be chocolate coated, a giant crushing scoop of ice cream, and others.
When they finally reached the mound of ice cream, the Delightful Children ordered their men collect it to give it to the adults in an exclusive party. Before that, they planned to be the first to taste the Fourth Flavor in generations. But by adding sprinkles to the ice cream, they broke the first of all rules by eating an ince of ice cream, sacredly respected at the temple where the fourth flavor was to never, under any circumstance, add flavorings to an ice cream. Because of this "rule-breaking" the entire temple began to collapse around them, and the Fourth Flavor was condemned to get lost forever. The Delightful Children and their henchmen escaped, but Numbuh 5 decided to risk her own life in order to try to taste the fourth flavor, knowing that never on her entire life would have another chance to do it. She was close to do it directly, but a lightning caused by the cave's destruction separated of it.
At the end of the adventure, Numbuh 5 sees the destroyed cave and thinks that she would never taste the Fourth Flavor, but then discovers just a small amount of the gold colored treat on her hat. Before she could say what it tasted like, Numbuh 1 interrupted her by contacting her on the radio. Satisfied in having at least tasting the ice cream, she left the temple behind.
- When he was recommissioned, Numbuh 0 felt a craving for blurpleberry ice cream, claiming it to be the closest thing to the actual Fourth Flavor he ever tasted, revealing that he was deemed worthy to partake of the legendary flavor, and finally giving viewers a hint of what the fourth flavor tasted like.