Shine your astro spurs and don your robot fists! Justice rides a rocket steed across the crimson plains of the fourth planet, where one man brings hope to humans who make this frontier world their home. He is...Sparks Nevada: Marshal on Mars. Alongside his trusty Martian sidekick Croach, Sparks protects Mars from robot outlaws, alien invaders, and any galactic threat foolish enough to target the red planet. Collects The Thrilling Adventure Hour Presents: Sparks Nevada: Marshal on Mars #0-4.