Star Trek: The Next Generation - Season 6 - Eps 24: Second Chances
Stardate: 46915.2. Riker discovers that eight years ago, an exact clone of him was created when he beamed through a planet's surface while returning to his starship. This clone, named Thomas Riker, has secretly remained on the planet for the past eight years, and still has romantic feelings for Troi.
About Star Trek: The Next Generation

Title: Star Trek: The Next Generation
First Air Date: 1987-09-28
Last Air Date: 1994-05-23
Status: Ended
Rating: 8.4/10 (from 1547 votes)
Language: EN
Seasons: 8
Total Episodes: 176
Network: Syndication
Genres: Sci-Fi & Fantasy, Action & Adventure, Drama, Mystery
Production Companies: Paramount Television, Norway Corporation
Synopsis
Follow the intergalactic adventures of Capt. Jean-Luc Picard and his loyal crew aboard the all-new USS Enterprise NCC-1701D, as they explore new worlds.
Cast

Patrick Stewart
Jean-Luc Picard

Jonathan Frakes
William T. Riker

Brent Spiner
Data

LeVar Burton
Geordi La Forge

Michael Dorn
Worf

Marina Sirtis
Deanna Troi

Gates McFadden
Beverly Crusher