A stowaway creature is discovered devouring the Maru's electronics. Unable to stop the creature from moving to the Andromeda and reproducing, the crew must find the creatures before they permanently cripple the ship.

In an alternate timeline, Gaheris Rhade takes command of the Andromeda and attempts, with the aid of the crew of the Maru and a hologram of Dylan, to reestablish the Commonwealth and drive back the Magog threat.