Underdog - Season 3 Episode 14 The Marbleheads, Part 2

After all the reporters and news crew leave the site of the strange object, two stonehead creatures from the planet Granite, named Gravel and Crusher, emerge from the craft with their Granite Gun. Their mission is to collect 10 slaves to bring back to their planet to work in the rock mines. After reporting in to their fearless leader, Captain Marblehead, the two buffet on some of Earth's stones and marble. They then proceed with their mission and collect 10 slaves, which so happen, include Shoeshine Boy and Sweet Polly. Before they leave for home, they are observed and the army tries to stop them.