The episode, which was aired on television in 1993, features a guest appearance by astrophysicistStephen Hawking. In this episode they once again encounter the Borg aliens. Set in the 24th century, the series follows the adventures of the Starfleet crew of the Federation starship Enterprise-D. ' Descent' is the 26th episode of the sixth season and the first episode of the seventh season of the American science fiction television series Star Trek: The Next Generation, the 152nd and 153rd episodes overall. List of Star Trek: The Next Generation episodes
