| "Through the Looking Glass" | |
|---|---|
| Star Trek: Deep Space Nine episode | |
| Episode no. | Season 3 Episode 19 |
| Directed by | Winrich Kolbe |
| Written by | |
| Featured music | Jay Chattaway |
| Production code | 466 |
| Original air date | April 17, 1995 |
| Guest appearances | |
| |
"Through the Looking Glass" is the 65th episode of the television show Star Trek: Deep Space Nine, the 19th episode of the third season.
Set in the 24th century, the series follows the adventures of the crew of the space station Deep Space Nine. This episode takes place mostly in the Mirror Universe, a parallel universe that is home to more aggressive, mistrustful, and opportunistic doppelgangers of the regular characters of the Star Trek universe, governed by a brutal alliance of the Cardassian and Klingon races. In this episode, Deep Space Nine's captain Benjamin Sisko must assume the role of his dead counterpart in order to save the mirror version of his late wife.