Field of Fire (Star Trek: Deep Space Nine)

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"Field of Fire" is the 163rd episode of the television series Star Trek: Deep Space Nine, the 13th episode of the seventh season. The episode first aired the week of February 8, 1999, and was written by Robert Hewitt Wolfe and directed by Tony Dow.

Set in the 24th century, the series follows the adventures of the crew of the space station Deep Space Nine; the later seasons of the series follow a war between the United Federation of Planets and an empire known as the Dominion. In this episode, station psychologist Ezri Dax investigates a serial killer at work on Deep Space Nine. Ezri, who is symbiotically joined to the long-lived sluglike creature Dax, calls upon the memories of a previous host of the symbiont to assist in the investigation.