Data's Day

"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.