"The Jem'Hadar" is the 26th and final episode of the second season of Star Trek: Deep Space Nine.
Commander Benjamin Sisko, Jake, Nog, and Quark have entered the Gamma Quadrant to conduct a planetary survey for the boys' upcoming science project in school.
On the station, the USS Odyssey is due to arrive in eight hours when something begins coming through the wormhole. Kira tells Dax to display it on the viewscreen and it is a Jem'Hadar attack ship. Dax hails the vessel and raises the station's shields, but a Jem'Hadar beams into Ops despite the shields. O'Brien activates a containment field around the intruder and Kira introduces herself before telling the Jem'Hadar it is "customary" to identify oneself before beaming into someone else's command center.
The Jem'Hadar introduces himself as Third Talak'talan of the Jem'Hadar and informs Kira that Commander Sisko has been detained indefinitely. Sisko, he says, will serve as an example to anyone who interferes with the Dominion by coming through the wormhole. Dax defiantly tells him that idle threats will not stop the Federation from exploring the Gamma Quadrant, so he walks through the force field and gives Kira a Bajoran PADD with a list of vessels he says have been destroyed for violating Dominion territory. The PADD came from New Bajor, he tells her, adding that they fought well for a "spiritual" people. He beams back aboard his ship and O'Brien attempts unsuccessfully to lock on with a tractor beam as it re-enters the wormhole...