Niles lies to Daphne about his lunch plans with Maris.

In first episode of 24, Jack Bauer is called into work at the Counter Terrorist Unit, where he learns that an assassination attempt will be made on presidential candidate David Palmer. Meanwhile, Jack's daughter Kimberly sneaks out of the house and his wife Teri sets out to find her.

An out-of-this-world case brings Brennan and Booth to New Mexico where they investigate human remains with extraterrestrial attributes. The victim is identified as a local UFO fanatic, known around town for her relentless search for alien life forms and whose latest “evidence” leads even Brennan and Booth to re-think outside existence. Meanwhile, a local sheriff refuses to release the bones, forcing the team at the Jeffersonian to work via satellite, and Angela and Jeffersonian intern Wendell (guest star Michael Grant Terry) come clean about their relationship.

With the team's help, Vance faces his demons while uncovering a complex relationship with a killer that puts his whole family in danger.

Gibbs questions DiNozzo's ability to do his job when the elder DiNozzo becomes involved in their investigation of an assassination attempt on a foreign prince.

An overwhelming Klingon task force mysteriously arrives at the station, supposedly to aid their Federation allies in the fight against the Dominion.

The war against the Dominion reaches its final confrontation when Sisko leads the Federation Alliance in an attempt to invade the Cardassian homeworld.

Worf's foster brother violates the Prime Directive in an effort to save a doomed alien race.

After a 747 explodes over the Mohave Desert, Jack investigates while he continues to search for Senator David Palmer’s potential assassin and the whereabouts of his daughter. Meanwhile, Palmer discovers another threat to his campaign is about to surface.

A wounded gang member tries to leave the ER to exact revenge. Benton keeps Reese's hearing disability a secret from his co-workers. Jeanie tells Ross she'd like to be his physician assistant in the pediatric emergency room. Weaver interviews for the job as permanent Chief of Emergency Medicine. Hathaway discloses to Ross that she might be pregnant but later discovers she's not. Lucy misplaces a dead body as she transports it to the morgue. Her inability to start an IV is revealed during a crisis. Corday realizes that her abilities exceed what will be demanded of her as an intern.

After a teenaged runaway is found shot in the chest, Detectives Fontana (Dennis Farina) and Green (Jesse L. Martin) begin to suspect his upstate "soccer mom," who admits she killed her vicious son out of fear that he would follow in his criminal father's footsteps. As ADAs McCoy (Sam Waterston) and Borgia (Annie Parisse) charge her with second-degree murder, the defendant's attorney claims that her client did society a favor by ending her son's life prematurely -- and new video evidence might sway a jury. S. Epatha Merkerson and Fred Dalton Thompson also star.

Kimberly and Janet find themselves in great danger and must look for an escape route. In her search for Kimberly, Teri has found help from Janet's father Alan York. Meanwhile, Palmer attends a secret meeting about disturbing news that is about to break, and Jack discovers a key card that could lead him to the terrorist organization.

Stardate: 49122.4 Gul Dukat asks Kira to help him search for Bajoran prisoners of war - one of which is his half Cardassian/half Bajoran daughter Ziyal.

Stardate Unknown: Sisko discovers the legendary Bajoran city of B'hala. He also receives visions of Bajor's future, one of which warns him not to let Bajor join the Federation.

It is discovered that Quark's mother, Ishka, broke Ferengi law and made a profit through a secret deal, which may cost Quark everything he has.

Sisko has visions of himself and his crew as writers for a science fiction paper in 1950's Earth.

Sisko discovers that Kasidy is smuggling medical supplies to the Maquis.

With the Cardassian Resistance crushed, the Federation war against the Dominion reaches the prelude to one final showdown.

Determined to prove the superiority of his race, a Vulcan Starfleet officer challenges Sisko and his crew to a baseball game.

The Defiant attempts to rescue Captain Lisa Cusak who has crashed on a planet with high amounts of carbon dioxide, with a limited supply of triox to keep her alive. Meanwhile on the station, Quark attempts to keep Odo distracted while planning an illegal transaction.