Babylon 5: A Call to Arms is a 1999 American made-for-television film and the fourth film set in the Babylon 5 universe. It was written by J. Michael Straczynski, directed by Mike Vejar, and originally aired on TNT on January 3, 1999, as one of two films shown over the 1998–1999 season to fill in the gap between the fifth season of Babylon 5 and the spin-off series Crusade.