Sisko plays a critical role in the intrigue of the . His actions prove key in the security of and the whole Alpha Quadrant. Examples include when he meets his former Captain, Admiral Leyton and learns that he planned on overthrowing the Federation government. Leyton framed Sisko as a shapeshifter who infiltrated Starfleet by faking a blood test. Sisko subsequently escaped custody with the help of and stopped Leyton's plans. During the invasion of , he is crucial to exposing the impersonating Klingon general . Sisko's exploits continue during the Dominion's invasion of the Alpha Quadrant, eventually working alongside to help plan massive actions against the Dominion and their Cardassian and allies. Sisko's contributions to the war effort are sometimes more surreptitious, such as his clandestine work with former operative . Specifically, Garak and Sisko work to bring the into the war by creating an elaborate ruse. He and Garak, with the help of a petty criminal, create a sophisticated holoprogram, specifically the recording of a high-level Dominion meeting planning the invasion of Romulus. They were to then give the fabricated evidence to Senator Vreenak, a Romulan Senator visiting the station who had staunch pro-Dominion leanings. As the ruse progressed however, due to several unforseen complications that arose along the way, Sisko was grudgingly forced to set aside his an increasing amount of his moral certainty to make the plan a success and save the Federation, such as bribing Quark, and becoming an accessory to murder twice over. Vreenak discovered the forgery quickly enough, and angrily departed the station, determined to expose Sisko's plan to the entire Quadrant. En route back to Romulus, however, he was assassinated by a bomb Garak had clandestinely planted in his shuttle. Ironically, it wasn't the holoprogram itself, but Vreenak's assassination that brought the Romulans into the war, since the Tal Shiar (the Romulan equivalent of the Obsidian Order) believed the senator was assassinated by the Dominion after he found evidence of their planned invasion, and not by not Garak, after discovering the data rod containing the holoprogram of the invasion plans that the Tal Shair assumed he was bring back to Romulus to warn his government, and any errors or flaws in the data stored within the rod was due to from damage from the explosion and not because it was a sophisticated forgery. Sisko was enraged when he figured out that Garak was behind the assassination, but later admitted with a note of bitterness that Garak was right, in that two deaths and an uneasy conscience was a very small price to pay in order to save the entire Alpha Quadrant.. Benjamin Lafayette Sisko is a fictional character in the Star Trek franchise. He appears in the television series Star Trek: Deep Space Nine (DS9).. Deep Space Nine was the first Star Trek series to be created without the direct involvement of franchise creator Gene Roddenberry, the first set on a space station rather than a traveling starship, and the first to have a person of color—Commander Benjamin Sisko (Avery Brooks)—as its central character..