Needing a stabilizer on the Defiant, Captain Sisko orders Chief O'Brien to have part in place on the ship when he returns in three days. Unfortunately, O'Brien won't be able to procure the item for three weeks. Overhearing the conversation with the Captain is Nog, who offers to use a bit of his Ferengi sense of commerce to find the stabilizer for the Chief in three days. Elsewhere, Odo receives a message from his Cardassian contact, long thought dead, to rendezvous with him at their usual location. While there, Odo discovers that his contact is in fact dead. In his place stands Weyoun, who has decided to defect to the Federation.

Stardate: 52136.4 Voyager investigates a strange alien structure in space. To their surprise, they find it is a staging point for Species 8472's planed incursion into normal space, and attack on the Federation. They have found a means to take human form, and are training in a recreation of Starfleet Academy.

Prue's dreamland turns into a nightmare, when a deranged sleep researcher turns her subconscious into his own personal playground. The only way to stop him is to do battle within his otherworldly domain.

A full moon means bad luck for several residents of Capeside. Dawson comes to a realization about his parents marriage. Jen goes on a date with Vince that ends with Grams catching the two making out. Andie agrees to go out with Pacey but doesn't want him picking her up at her house. Pacey meets Andie and Jack's mother and Andie has to tell him the truth about her family. Jack kisses Joey.

A murder-for-hire business has a unique body disposal system... funeral caskets.

Dick tells Mary he thinks they should see other people, and she laughingly agrees, not knowing he already has a candidate lined up - new officemate Jennifer. Dick is fascinated by Jennifer's intoxicating giggle, her adorable penchant for rhyming, and the brave way she copes with her numerous food allergies. Just as a furious Albright learns of Dick's new dalliance, he begins to grow less and less enchanted with Jennifer's eccentricities (particularly the rhyming), and to regret ever having ended things with Mary. Meanwhile, Sally, Harry, and Tommy question the limited functions of the kitchen and the living room, and decide to design an Uber-room with the best elements of each - "the Klivingtchen".

Greg is forced to make a very embarrassing public admission when he sees the first girl he claims to have slept with and her jealous husband makes some serious threats. Meanwhile, Dharma and Greg attend the wedding of Kitty's housekeeper and offer to park cars as a wedding gift.

Brandon announces that he has accepted a job with the Washington bureau of the New York Chronicle. Kelly and Donna prepare to open their store, Now Wear This. Brandon becomes unnerved by the realization that Kelly is getting on with her life, and feels threatened by Matt's presence. Kelly meets with Leah, who explains that she returned to Lenny after learning that she was pregnant, but left again when he threatened her life. Although Kelly insists that she doesn't need his help, Brandon writes a story about the custody case. Brandon decides that he wants to stay in Los Angeles, but Kelly urges him to take the job and pursue his dreams. The gang throws a surprise going-away party for Brandon. Before departing, he convinces his parents to let Steve, Val and Noah stay in the house. Donna turns to Matt for comfort as she and Noah drift further apart. Valerie seeks legal advice from Matt. She explains that the killing was an accident, but Matt warns that a jury may not agree. Abby tells Val

After the detectives find a murdered postman and a woman who was left for dead in her apartment, the investigation leads to a serial killer and a surprise.

Tonight on the show, actress and singer Queen Latifah.