Tell me about the Shadow War from Babylon 5

Well, I've seen up through Season 3 of Babylon 5 (I own Seasons 4 and 5, but I lost momentum the last time I watched them), so I know more than 'nothing', but...

There are a bunch of Sufficiently Advanced Aliens in the B5 galaxy, and the Shadows are one, and they are the 'Social Darwinist for Dummies' sort who like to stir up conflict.

So int he first few seasons, they are out doing that and being the scary thing that lives in space, until Babylon 5 crew and Minbari (who have fought the Shadows before) are all 'will you just go away' and trying to stop them.

4 is good. There are like 3 episodes in 5 that are worth watching

The Neil Gaiman one, and the last 2

IIRC, the war wraps up in Season 4 because Season 5 was in the 'maybe it will, maybe it won't' so it feels a bit rushed. Sinclair goes back in time to be a Minbari prophet, and Sheridan nearly dies and tells all the older species to stop helicopter-parenting the younger species.

I concur with Peter Turbo