The Super Mario Bros. Super Show! (1989)

S01E27 On Her Majesty's Sewer Service

When Koopa takes down Princess Toadstool's top spy, James Blond, Mario and Luigi step up to the plate as secret agents. Determined to rescue their friend and thwart Koopa's evil plans, the brothers dive into a world of espionage and adventure, utilizing their skills and wits to navigate through various challenges. With stealth and teamwork, they aim to restore peace and save the kingdom from Koopa's clutches.