The Slag Brothers are fictional characters from the animated television series The Wacky Races, which originally aired in the late 1960s. They are known for their rugged appearance and are often seen driving a vehicle called the "Boulder Mobile," which is made from large rocks. The brothers, named Rocky and Cecil, are characterized by their strong, silent demeanor and their tendency to use brute strength to overcome obstacles. In the series, the Slag Brothers compete against various other racers, including Penelope Pitstop and Dick Dastardly. Their antics often lead to humorous situations, as they try to outsmart their opponents while relying on their physical prowess. The Slag Brothers are memorable for their unique design and the comedic elements they bring to the show.