The Enterprise arrives at Deep Space Nine where a mysterious alien, Jaglom Shrek, claims he can prove that Worf's father Mogh, is still alive. Meanwhile, an accident in engineering incapacitates Data. After he's revived, he insists he saw his father, Dr. Noonien Soong, while unconscious. Dr. Bashir, the station's physician, theorizes that Data may have had a dream. Intrigued, Data attempts to reenter his dream state in order to learn more about his creator, while Worf seeks out Shrek and embarks on a journey to a distant Romulan prison where his father is supposedly being held. What he finds there could be deadly...