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The pilot episode, which eventually became "Rollercoaster", contains colored storyboards, temporary music and sound effects, and completed voice lines that are mostly left unchanged in the final episode with a few deleted lines. It also contains a few similarities with the original story bible, such as the characters having their initial color schemes and Doofenshmirtz being called Middleschmirtz. Only the last minute and fifteen seconds are fully animated.

In this special episode, Agent P leads a rather inept team of trainees, including Dr. Doofenshmirtz, to try to stop an evil mastermind from taking over the O.W.C.A. Meanwhile, the Bug Trio continue their frivolous attempts at human communication.