The epic sci-fi series Babylon 5 was a unique experiment in the history of television. It was effectively a novel for television in five seasons, consisting of 110 episodes with a clear beginning, middle, and end. The first season introduces the main characters, headed by Commander Jeffery Sinclair (Michael O'Hare) and Security Chief Michael Garibaldi (Jerry Doyle), and familiarizes the audience with the unique environment of a five-mile-long space station in the year 2257.  Captain John Sheridan (Bruce Boxleitner) arrived on Babylon 5 in the first episode of season 2, "Points of Departure." The show marked the handing over of command of B5 to Sheridan from Commander Jeffery Sinclair, actor Michael O'Hare becoming a victim of studio politicians who wanted a bigger star in the leading role.