4. Star Trek: Deep Space Nine (1993-1999)
Turns out, Star Trek: Deep Space Nine is a spinoff of a spinoff. Taking the show to a space station rather than a spaceship was a spinoff of Star Trek: The Next Generation, which was a spinoff of the original, Star Trek. Both spinoffs were more successful than the original, lasting seven seasons, compared to the three the original Star Trek ran for. It makes sense, too. What could possibly be better than watching a show that takes place on a space station that was once owned by an occupying alien army? Part of the show’s success was that its storyline let it evolve more; hence, the seven seasons.