Okay, so we’ve had several sci-fi stories where the main character slips between timelines and times in their lives (looking epecially at you, Picard in “All Good Things…”), but they specifically mention Sheridan being “unstuck in time” which is absolutely a Slaughterhouse Five reference.
Also, for folks who have checked out the Babylon 5 Viewing Guide, this is almost certainly a film to check out after checking out the series. If you don’t believe me, ask Zathras.
Actually, just believe me. Because as Zathras points out yet again, no one listens to Zathras.