The episode was called "War Without End," it was a two parter in the middle of Season 3, and it finally tied up the Sector 14, Babylon 4 and Jeffrey Sinclair / Valen plot threads.
In that episode, Sinclair used that house of cards construct Delenn had built during Season 1 to reverse-engineer his genetic structure. When he emerged from his Chrysalis, his genetic structure was Minbari; a Minbari not born of Minbar.
The predestination paradox was completed in the movie "In The Beginning," when Sinclair's Starfury was picked out of the Line by Delenn herself, thus fulfilling one of Kosh Naranek's cryptic sayings, "The future points to itself."
Sinclair's lineage as Valen was manifest sometimes during the show, in that the crystal house of cards thing required the use of that glass crystal triangle thing with the broken circuit inside it to work.
The glass triangle thing with the circuit glowed faintly in Delenn's presence, causing immense consternation amongst the rest of the Grey Council at the time; and when Sinclair was brought before the Grey Council, that glass thing positively flared up. Because it was in the presence, respectively, of a child of Valen and of Valen himself.
It was a kind of Valen gene detector, I suppose, which explains why only Sinclair and Delenn could have used the house of cards device: it had been built to work on Sinclair and members of his bloodline only.
I have not seen episodes from that old B5 series for damn near ten years, and yet I recall the story as though it were yesterday.
...
Oh. One other thing.
During Season 1, Delenn and Sinclair participated in a Minbari ceremony in one episode. They both ate a red berry. Afterwards, Delenn said that participants who ate the red berry would have one of two things happen to them: they were going to change, or they were going to get married.
We never saw Catherine Sakai marry Sinclair. But boy, did he change.
I love my eidetic memory. It's like having a TiVo in my head.
