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The Slag Brothers are characters on Wacky Races. They were originally voiced by Daws Butler and Don Messick, then by Jim Cummings.

About The Slag Brothers[]

Rock and Gravel Slag are twin cavemen driving a wheeled boulder, the Bouldermobile. They can accelerate by hitting the car (or at times, each other) with their clubs. The Slag Brothers sometimes reconstructed their car from scratch just by using their clubs on any large boulder that was available. Like the Gruesome Twosome, the Slag Brothers can summon up appropriate creatures such as pteranodons to help them. The Slags also speak by combining stereotypical caveman language with normal English, e.g. "Raga-radda, wheel gone. Get new one!" In one episode, the Bouldermobile had a "flat" tire, when a wheel turned square. In another episode, a wheel fell off, and Gravel Slag accidentally made a square wheel from a rock, to which Rock Slag responded, "Rah Dummyhead! You make square wheel!"

The Slag Brothers rarely interact with the other racers, aside from the Gruesome Twosome in the Creepy Coupe or Penelope Pitstop in the Compact Pussycat.


  • The Slag Brothers hold the most second place wins.
  • The Slag Brothers' character design was re-used for Captain Caveman.