Mario Joe and Luigi Bob

Mario Joe and Luigi Bob are two cousins of Mario and Luigi; described as both hicks and country bumpkins, Mario Joe and Luigi Bob, aside from their clothing, look completely identical to Mario and Luigi.

Near the start of The Super Mario Bros. Super Show! episode "Mario Hillbillies", Mario and Luigi were waiting for both Mario Joe and Luigi Bob to arrive at Mario Brothers Plumbing so they could all go on a fishing trip. Eventually, the impatient Mario Bros. decided to leave without their tardy cousins, and Mario leaves a note for them, explaining where he and Luigi went and telling Mario Joe and Luigi Bob to make themselves at home in the apartment. Just as Mario and Luigi left Mario Brothers Plumbing through a back entrance, Mario Joe and Luigi Bob arrived through the main entrance. Noticing that Mario and Luigi weren't home, Mario Joe and Luigi Bob find Mario's note on the apartment's scarecrow. Upon reading aloud the part of the note that told them to make themselves at home, Mario Joe and Luigi Bob let out a joyous yell and ran over to Mario and Luigi's refrigerator, which they began to look through.

Later, Mario Joe and Luigi Bob began to relax at Mario and Luigi's table, eating large amounts of food from the fridge. After some small talk involving what pepperoni was and where it came from, Mario Joe and Luigi Bob heard the doorbell of Mario Brothers Plumbing; and after some hesitation, yelled for whoever was at the door to come in. A woman entered and asked if Mario Joe or Luigi Bob had a faucet, as she was in need of a new one. As Mario Joe tells the visitor that he wasn't sure and prepares to inform her wasn't actually Mario, Luigi Bob stops him, saying he wasn't sure if there was a faucet in the plumbing shop at the moment. As the visitor brooded over her bad luck, Mario Joe tried to cheer her up, prompting the visitor to introduce herself as Ellie Mae and ask their names in return. Stuttering, Luigi Bob introduced himself as Luigi, while Mario Joe introduced himself as Mario. Upon learning the two's supposed names, Ellie Mae told Mario Joe and Luigi Bob that they were just the kind of plumbers she's looking for: country bumpkins, like her.

Afterwards, as Ellie Mae played with the Ratigators (who Mario Joe and Luigi Bob call Zeke and Luke) Mario Joe and Luigi Bob began trying to put on tool belts and gather up various plumbing equipment. As Mario Joe and Luigi Bob struggle, Ellie Mae tells them how kind they were to make a house call for her, but she was beginning to show doubt in their abilities. Mario Joe and Luigi Bob reassured her and said it was an honor to fix her plumbing. Charmed, Ellie Mae decided to have Mario Joe and Luigi Bob stay over for a possum dinner, then they all leave for her house.