This is similar to one of my other questions, but instead of asking about the station, I am asking about a character who was on the station.
When Babylon-4 was nearing the final stages of construction, an unknown creature appeared on it. The station became unstuck in time and disappeared along with the creature.
We later discovered that the creature was Zathras, one of the caretakers of the Great Machine.
What happened to him after the station took him back in time by a thousand years?
I know what happened to his co-traveler, but not to him.
I will accept answers from novelizations, TV episode scripts, movie scripts, writings by the producers, and interviews with scriptwriters.