Season Four begins with "", which marks the arrival of Worf. This episode is one of a few in this season to explore themes of suspicion and paranoia and their effect upon societies and relationships, building up to "Homefront" and "Paradise Lost". After the events of "The Die is Cast", fear about the identities of the infiltrator changelings leads the Klingons to suspect Dominion involvement in the new Cardassian civilian government. Their refusal to break off an invasion, even after Dominion involvement has been disproved, results in a military confrontation and diplomatic breakdown, and the Klingons attempt to seize Deep Space Nine. This seems to further the Founders' goal of the destabilization of the Alpha Quadrant as a prelude to their own invasion.