Star Trek: Deep Space Nine, season 4, episode 17
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Summary
A famous Bajoran poet, Akorem Laan, who disappeared over 200 years ago, appears from the wormhole and convinces Sisko that he is the true Emissary, but when he announces a return to the pre-occupation caste system, Sisko points out it would disqualify Bajor for membership in The Federation. O'Brien is less than enthusiastic when Keiko announces she's expecting.
Summary from Wikipedia, CC BY-SA 4.0.
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