This move angers Dr. Crusher, who believes Dr. Russell is trying to use Worf as a sort of guinea pig to test her unproven technique. They argue outside Worf's quarters until they are called to assist with the survivors of the crash of another starship. There, Beverly is further angered when Russell's use of another experimental technique leads to the death of a patient. Unable to trust her colleague, she relieves Dr. Russell from duty.

Worf still refuses to consider the implants and insists he wants to die. Because of this, Picard tries to convince Dr. Crusher to let Dr. Russell perform the experimental surgery, but Beverly stands firm. At the same time, Riker confronts Worf, reminding him that Klingon law dictates that it is Worf's son, and not Riker, who is supposed to assist in Worf's death. Unable to deny this, Worf abandons the idea of killing himself, and asks to try Dr. Russell's surgery instead.

Dr. Crusher reluctantly agrees, and together, she and Dr. Russell perform the operation. While the technique initially appears to be a success, Worf suddenly goes into cardiac arrest — and dies on the table. Dr. Crusher tries desperately to revive him, but eventually is forced to acknowledge that he is gone. But thanks to a mysterious Klingon biochemical reaction, Worf suddenly revives a few minutes later and goes on to recover. Dr. Crusher, however, is unable to forgive Dr. Russell for endangering the life of her colleague and friend.

"Lonely Among Us" - While passing through an energy cloud, an intelligence is picked up, taking over Worf, Beverly Crusher, Assistant Chief Engineer Singh, and Captain Picard.

"The Battle" - A Ferengi "thought-maker" is used by Daimon Bok to cause Captain Picard to relive the Stargazer incident that occurred nine years previous.

"Hide And Q" - Q takes over Data, and tells Riker that he has been given the powers of the Q.

"Conspiracy" - Several members of Starfleet high command are taken over by the "Blue Gill" creatures.

"The Child" - A glowing white sphere enters the Enterprise, and causes Troi to become pregnant with an alien child.

"The Schizoid Man" - Data gets taken over by Ira Graves, who transfers his mind over to Data.

"Contagion" - Data gets infected with an alien virus.

"Allegiance" - Captain Picard gets kidnapped, and is replaced by an evil imposter.

"The Best of Both Worlds" - Captain Picard is kidnapped by the Borg, and is turned into Locutus of Borg.

"Brothers" - A homing program in Data is activated by Data's creator: Dr. Noonian Soong.

"Clues" - Troi gets taken over by an alien race that simply wants to be left alone.

"Identity Crisis" - LaForge and another member of Starfleet gets taken over by a parasite from an earlier away team mission in 40???.?.

"The Nth Degree" - Barclay gains the intelligence of an alien probe.

"The Minds Eye" - LaForge is brainwashed by the Romulans, and made to accomplish a Romulan mission.

"The Game" - Riker brings back an electronic game from Raisa which is not only addicting, but provides a form of mind control for everyone on board ship. Under this mind control, Riker, LaForge, Troi, and Dr. Crusher deactivate Data.

"Violations" - Troi, Riker, and Dr. Crusher face inexplicable comas while a group of aliens are on board. The comas are caused by a nightmare.

"Conundrum" - The entire crew, including Data, is affected by sudden amnesia, and is involved in a war.

"Power Play" - Troi, O'Brien, and Data is taken over by the spirits of cadet prisoners on a penal colony set up by the Ux-Mal.

"The Inner Light" - A space probe interfaces with Captain Picard, and forces him to relive the life of another man.

"Man Of The People" - A visiting mediator uses Deanna Troi to pass on his negative emotions.

"Face Of The Enemy" - Deanna Troi is captured by a Romulan, and is used to help in a defection.