Through the Looking Glass

Star Trek: Deep Space Nine  Season 3 Episode 19

Air Date: 4/23/1995

Entering the operations center, Chief O'Brien asks for a bit of Commander Sisko's time. Before anyone can stop him, O'Brien places a phaser to Sisko's back and transports him off of the station. There, O'Brien explains that he is the mirror universe O'Brien. Sisko is needed to take the place of the now deceased mirror universe Sisko in order to keep the rebellion against the Alliance alive.