In 2121 A.D., Commander DeSoto led a task force comprised of Able, Delta and Echo Squads for a Recon-and-Force Mission to Mars. Their mission was to locate a new massive underground Neosapien Weapons Complex on Mars based on the ExoFleet spy Marduk, who had gone missing after handing over information on this Weapons Complex to ExoFleet.
The mission was a trap, set up by Neosapien Spy Barca, and Delta and Echo Squads took heavy causalities. A retreat was called and all E-Frames returned to their ships. Delta and Echo Squads were assigned to the Avenger which was ultimately destroyed by Barca, killing Commander DeSoto along with the rest of Delta and Echo Squads.
- Episode 35: Fire Ship