John Sheridan is a fictional character from the science fiction television series Babylon 5, created by J. Michael Straczynski. He serves as the commander of the space station Babylon 5 and plays a crucial role in the series' overarching narrative, which explores themes of politics, war, and diplomacy among various alien species. Sheridan is portrayed by actor Bruce Boxleitner and is known for his strong leadership qualities and commitment to peace. Throughout the series, he faces numerous challenges, including conflicts with the authoritarian Earth Alliance and the powerful alien race known as the Shadows. His character evolves significantly as he navigates these complex situations.