A survivor found aboard an ancient Bajoran ship claims to be the true Emissary of the Prophets.
4-25: Broken Link
When Odo is struck with an unknown illness, Sisko seeks help from The Founders, who enact a punishment against Odo for harming another Changeling.
4-03: The Visitor
When a freak accident traps Sisko in a time paradox, only re-appearing every few years, Jake spends the remainder of his life trying to save him.