Star Trek Deep Space Nine Season 6
Deep Space Nine's sixth series began ambitiously with a six-part story arc devoted to the Dominion War. This was a brave move in many ways, but a sensible one too. Whereas other SF shows wouldn't commit to showing the impact of war (Babylon 5), here there were numerous visible sacrifices. Characters were frequently kidnapped and held prisoner, allowing screen time for other members of the ever-growing cast (at its peak there were as many as 18 individuals with speaking roles per episode).
Of all the spinoff TV incarnations of Star Trek, Deep Space Nine had the hardest job persuading an audience to watch. By all accounts, Gene Roddenberry had concerns about the idea before his death in 1991. It took two more years to develop, and when it finally aired in 1993 reasons for that concern were evident right away. The show was dark (literally), characters argued a lot, no one went anywhere, and the neighbouring natives were hardly ever friendly.