The overarching plot of "Scavengers Reign" follows the survivors as they independently journey towards the crashed Demeter. Ursula and Sam's journey is one of scientific discovery, but it takes a dark turn when they encounter a prior survivor who has become a host for a parasitic organism. Sam becomes infected, and in Episode 10, realizing he is losing control, he heroically tears the parasite from his chest and dies to save Ursula.
Azi's story focuses on her bond with the robot Levi, which becomes increasingly organic after interacting with Vesta's flora. Levi is destroyed mid-season but is resurrected by the planet's ecosystem, transforming into a powerful bio-mechanical hybrid. This transformation is key to the finale.
Kamen, consumed by guilt for causing the initial accident on the Demeter, is manipulated by a telepathic creature called Hollow. This initially small creature feeds on Kamen's negative emotions, growing into a giant, powerful monster under his corrupting influence. In the finale, all surviving parties converge at the Demeter. A group of human scavengers led by the ruthless Kris has also arrived. Kris betrays everyone and escapes on the Demeter's only working shuttle, abandoning her own crewmate Barry. The monstrous Hollow, controlled by Kamen's psyche, attacks the remaining survivors (Ursula, Azi, and Barry). They are saved by the reborn Levi, who uses its deep connection to the planet to pacify Hollow and free Kamen from its psychic control. In the end, the survivors, now including Barry and the awakened cryosleep passengers, form a new community on Vesta, led by Ursula. Kamen remains alive but psychologically scarred and isolated. The final scene shows Kris, alone and starving in the stolen shuttle, being intercepted by a mysterious, silent ship, leaving her fate ambiguous.