[wdkrnls]

I heard the original story with O'Hare was for Babylon 5 to blow up after an alien attack and for the Babylon 4 to be sent forward from the past to replace it. We saw hints for that in two different premonitions in season 1. That's a pretty big departure from the story we actually got.

[db48x]

That’s entirely possible. The story was deliberately quite fluid so that it could be adapted on the fly to unforseen changes in the cast.