The Epic Tales of Captain Underpants S02E12 - Captain Underpants and the Taxing Trauma of the Treacherous Tattle Trials, Part 1
Summary:
A final exam sends George and Harold to the Doom Dome, where they must battle Melvin -- who's been injected with powerful nanobots -- in order to pass.
The Epic Tales of Captain Underpants S2E12 Screenshot