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Having previously met the brother he never knew he had in the second-season episode "Sins of the Father," Lt. Worf is further astonished to discover that he has a son named Alexander (Jon Steuer). This is brought to his attention by the boy's mother K'Ehleyr (Suzie Plakson), who Worf feels has betrayed him, thus he refuses to even see her. Worf's hostile attitude endangers Picard's diplomatic mission with the leader of the Klingon Empire (Charles Cooper), who in turn is being slowly poisoned by a mysterious assailant. Directed by Jonathan Frakes and written by Thomas Perry, Jo Perry, Ronald D. Moore, and Brannon Braga, "Reunion" was originally telecast November 10, 1990.