The Slag Brothers

The Slag Brothers are characters on Wacky Races.

About The Slag Brothers

Rock and Gravel Slag are twin cavemen driving a wheeled boulder, the Bouldermobile. 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 cubical. In another episode, a wheel fell off, and Gravel Slag accidentally made a square wheel from a rock, to which Rock Slag responds, "Rah Dummyhead! You make square wheel!" They can accelerate by hitting the car (or at times, each other) with their clubs. The Slag Brothers' character design was re-used for Captain Caveman.

The Slag Brothers were originally voiced by Daws Butler and Don Messick, respectively and currently by Jim Cummings.


  • The Slag Brothers hold the most 2nd place wins out of any racers.