Fifth Column (The Fall of the Neosapien Empire 2) - S2.E35

Admiral Winfield has the Earthbound resistance cells all launch attacks at once, as a prelude to the ExoFleet's invasion. Napier's group succeeds in part because of help from the Terran workers at the factory they were attacking. These workers join the resistance in the tanks that they had built for an assault on Phaeton City. On the way they are met by Neo tanks, and a battle begins at Battle Creek. Before the ExoFleet attack Weston gives Alec's flight recorder to Algernon. Meanwhile Galba learns of Phaeton's doomsday device and tries to notify the resistance, which is unable to contact the ExoFleet before the invasion begins.