A member of the elite Senate Guard commandos, Captain Argyus was tasked with overseeing the transport of an important Republic prisoner: Separatist mastermind Nute Gunray. Gunray's wealth and the careful manipulation of Darth Sidious ensured that Argyus' loyalties wandered. Argyus betrayed the Republic, and ensured Gunray's escape from the cruiser Tranquility.