Kirk's war against the Emerald Chain brings him face-to-face with his most dangerous enemy yet: Admiral Sato.When the Borg-augmented U.S.S. Omega liberates Tellar, Starfleet's U.S.S. Challenger arrives armed with anti-Borg technology, ordering Kirk to stop at any cost. But as Emerald Chain reinforcements descend, an unexpected proposal could force these old allies to choose between destroying each other... and saving the Federation once and for all.The explosive opening chapter of a Galaxy-shaking new arc starts here!