When the announcer Abner Doubledeal asks for amateur challengers to the current reigning champions, Leela and Amy step forward.
The pair are unable to improve on their first performance and lose all of their matches until they see the champions buying and using Nectar, a substance that helps them build body strength.
Leela and Amy quickly jump at the opportunity and buy Nectar themselves, soon becoming as strong as the champions and developing a long winning streak in further matches.
During this time, Fry begins to feel weird, and at one point, creates and envelops himself in a cocoon aboard the Planet Express ship.
The Planet Express crew fears that Fry has fully transformed into a butterfly, but his insect body falls away to leave him still human.