Star Trek: The Next Generation Original Series" in 1969, the "Star Trek" franchise had continued with "" (1973–74) and a series of films, all featuring the original cast. In the 1980s, franchise creator Roddenberry decided to create a new series, featuring a new crew embarking on their mission a century after that of "The Original Series". "TNG" featured a new crew that starred (for the majority of its seven-year broadcast run) Patrick Stewart as Captain Jean-Luc Picard, Jonathan Frakes as Commander William Riker, Brent Spiner as Lt Commander Data, Michael Dorn as Lieutenant Worf, LeVar Burton as Lt Commander Geordi La Forge, Marina Sirtis as
In Theory (Star Trek: The Next Generation) on VHS cassette, appearing on September 5, 1991, in the United States and Canada. The episode was later released on LaserDisc on September 24, 1996, and also included on the "Star Trek: The Next Generation" season four DVD box set, released in the United States on September 3, 2002. The first Blu Ray release was in the United Kingdom on July 29, 2013, followed by the United States on July 30. In Theory (Star Trek: The Next Generation) "In Theory" is the 25th episode of the of the American science fiction television series "", originally aired on June 3, 1991,