Babylon 5: The River of Souls, on TNT
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streaming sites: Amazon
This is the third Babylon 5 movie aired by TNT. It premiered in 1998, a few weeks before the end of season 5, but I think it actually takes place after the series. Review coming soon.
TV series: Babylon 5 * Crusade
TV movies: The Gathering * In the Beginning * Thirdspace * River of Souls * A Call to Arms * Legend of the Rangers
DTV: The Lost Tales * The Road Home