The Epic Tales of Captain Underpants S02E04 - Captain Underpants and the Preposterous Pulverizing of the Pestering Poopacabra
Summary:
George and Harold train a rat for extra credit. But when their subject escapes into the sewers, he's doused with toxic waste and becomes ... Poopacabra!
The Epic Tales of Captain Underpants S2E4 Screenshot