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|Star Trek: The Next Generation episode|
|Episode no.||Season 4
|Directed by||Robert Wiemer|
|Story by||Harold Apter|
|Featured music||Ron Jones|
|Cinematography by||Marvin Rush|
|Original air date||January 7, 1991|
"Data's Day" is the 85th episode of the American science fiction television series Star Trek: The Next Generation, the 11th episode of the fourth season. This episode introduces both Keiko O'Brien and Data's pet cat Spot.
As Data contemplates the impending marriage of his friend Keiko Ishikawa to Transporter Chief Miles O'Brien, he learns about the peculiar minutiae – such as last-minute jitters and ballroom dancing – that surround human nuptials. At the same time, he investigates the apparent death of the Vulcan ambassador whom the Enterprise was ferrying to the Neutral Zone in order to conduct treaty negotiations with the Romulans.
Data mentions his involvement in the impending wedding of Transporter Chief Miles O'Brien (Colm Meaney) and civilian botanist Keiko Ishikawa (Rosalind Chao) where he had been asked to give the bride away. However, when visiting with Keiko she announces that she has decided to call it off, telling Data in frustration that it will make her happier. Data then delivers this news to Chief O'Brien, believing that since O'Brien wants to make Keiko happy, he will be pleased, which he is not. Geordi (LeVar Burton) assures Data that the wedding will proceed as planned.
Data discusses the Enterprise's mission involving a Vulcan ambassador, T'Pel (Sierra Pecheur), who has arranged a secret meeting with a Romulan ship. Data is assigned as her escort while she is on board. T'Pel asks Data about the Enterprise's defense capabilities, which Data finds suspicious, but after Data informs her that he has the same safeguards as the ship's computer regarding reporting such requests to Captain Picard (Patrick Stewart), she drops the question, stating that she was interested only in testing Data's safeguards. Because Vulcans do not lie, Data decides not to pursue the issue.
Data then asks Dr. Crusher (Gates McFadden) to teach him how to dance, having discovered from her service record that she won dance competitions. She agrees to instruct him on the condition that he not share this information with the rest of the crew, for fear of again being called 'The Dancing Doctor'.
In the holodeck, Data almost instantly learns how to tap dance from Dr. Crusher before telling her that he is ready to dance at the wedding. Telling him that tap dancing is inappropriate for social dancing she attempts to instruct him in ballroom dancing, but Data finds it much more difficult, as he cannot watch Dr. Crusher's feet. Dr. Crusher is then called away to sickbay to deliver a baby, and Data is left alone with a holographic partner.
The Enterprise rendezvous with a Romulan warbird and, despite Picard's unease about the situation, T'Pel transports aboard. However, something interrupts the transporter signal and the ambassador is killed.
Finding no flaw in the transporter system, Data uses the principles of Sherlock Holmes to come to the conclusion that T'Pel was not really killed: The Romulans beamed her off the ship themselves and left behind genetic material designed to fool the crew into thinking that she died in a transporter accident.
Picard speeds back to intercept the Romulans in the middle of the neutral zone. He confronts the Romulan Admiral Mendak (Alan Scarfe) and learns that T'Pel is actually a Romulan spy. Before shots are fired, another Romulan warbird appears next to the first one and three more enter the sector, minutes away. Picard is forced to retreat into Federation space.
Data approaches Keiko to make amends. She informs him that she is not angry at him, and that the wedding will proceed as planned. Miles and Keiko are married by Captain Picard.
Later, in Sickbay, the captain and Data visit the newest member of the Enterprise crew—a baby born while the Enterprise was in mortal peril.
- Star Trek The Next Generation DVD set, volume 4, disc 3, selection 3