call, which had reported that the base came under attack from an unknown group of vehicles. Upon arrival, the ISDF discover that the base was attacked by an alien force called the Scions, and promptly work to secure the base and discover where they are operating. Learning that the Scions came from a planet within the Solar System that was unknown to astronomers, dubbed the "Dark Planet", Braddock sends his troops to investigate further. Cooke and Shabayev discover that the Scions are making use of structures and technology connected to the Cthonians, including a wormhole that links to another part of the galaxy. Braddock focuses on sending the ISDF after the Scions in order to defeat them, suspecting that they are attempting to create a superweapon that could endanger Earth. However, as the ISDF focuses on combating the threat, Manson, Cooke and Shabeyev begin questioning Braddock's motives. The AAN eventually determine that Braddock was acting without their authority, and was responsible for constructing Cerberus Base, as well as attempting to cover up information regarding the Scions. After Braddock is suspended from duty pending a court-martial, the AAN attempt to broker a peace between the two factions. The diplomat sent to oversee negotiations is killed in a surprise attack, with Manson and Shabeyev lost in the ensuing chaos when their dropship plummets and crashes. Cooke continues to focus on missions assigned by Braddock, returned to duty, eventually assisting in the capture of the Scion's leader from the dropship's crash site. Before Cooke can bring him back to the ISDF, a lone Scion craft contacts him, claiming to be Shabeyev, and informing him that Braddock has been lying, and that the Scions are linked to a former squadron of the ISDF. While she attempts to persuade him to bring the leader back with her, Braddock orders him to destroy the craft, claiming it is a Scion trick. At this point, Cooke is left with two options. ISDF alternate ending John obeys his superior's command and destroys the Scion craft. Braddock informs him that Manson and his men survived, but they refused to obey, saying that Braddock is a traitor to the AAN. Cooke inserts a small team under his lead and destroys the base. Manson's body is found at the outskirts of the base. They also find out that Burns has escaped. Following Scion transmissions, they locate the heart of the Scion