The third season of the American science fiction television series Star Trek: The Next Generation commenced airing in broadcast syndication in the United States on September 25, 1989 and concluded on June 18, 1990 after airing 26 episodes. Set in the 24th century, the series follows the adventures of the crew of the Starfleet starship Enterprise-D. This season featured the return of Gates McFadden as Dr. Beverly Crusher after she was replaced by Diana Muldaur for the second season. The season also saw the debut of several actors who would reappear in the same roles and others throughout the franchise, such as Dwight Schultz as Lt. Reginald Barclay, and Tony Todd as Kurn.

The second season of the American science fiction television series Star Trek: The Next Generation commenced airing in broadcast syndication in the United States on November 21, 1988, and concluded on July 17, 1989, after airing 22 episodes. Set in the 24th century, the series follows the adventures of the crew of the Starfleet starship Enterprise-D. Season two featured changes to the main cast, following the departure of Gates McFadden. Diana Muldaur was cast as Dr. Katherine Pulaski for a single season before the return of McFadden in season three. Academy Award winner Whoopi Goldberg also joined the cast after pursuing a role from the producers.