The legendary Reaper, Darrow, to defend Mars from a bloodthirsty would-be conqueror, begins his long voyage home, an interplanetary adventure where old friends will reunite, new alliances will be forged, and rivals will clash on the battlefield.

With Tara still in the clutches of the Elite Elgen Guard Unit the Chasqui and their malevolent leader, the Sovereign Amash, Michael Vey and the Electroclan have no choice but to continue the fierce battle that has been waging since their arrival in Peru. But saving one of their own means battling a onetime teammate, as Jack has turned traitor and joined forces with Amash and his men. At the same time, the clan must work with the Alpha Team to act...