Allegiance (Star Trek: The Next Generation) Allegiance (Star Trek: The Next Generation) "Allegiance" is the 18th episode of the of the American syndicated science fiction television series "", and the 66th episode of the series overall. It was originally released on March 26, 1990, in broadcast syndication. Set in the 24th century, the series follows the adventures of the crew of the Federation starship "Enterprise". In this episode, Captain Picard finds himself abducted from the "Enterprise" and held in a chamber with other prisoners, while a doppelgänger replacing him behaves strangely and gives increasingly disturbing orders. Captain Picard, while sleeping in his quarters on the "Enterprise"
Descent (Star Trek: The Next Generation) Descent (Star Trek: The Next Generation) "Descent" is the 26th episode of the and the first episode of the of the American science fiction television series "", the 152nd and 153rd episodes overall. Set in the 24th century, the series follows the adventures of the crew of the Federation starship "Enterprise". The episode features a guest appearance by Stephen Hawking, making it the only episode to feature a guest star appearing as themselves on any "Trek" series. On the holodeck, Lt. Commander Data plays a game of poker with holographic representations of Sir Isaac Newton, Albert Einstein, and Stephen Hawking.