DS9 Season 4 Episode 7 Starship Down

Plot

The Federation starship Defiant carries the senior staff of Deep Space Nine into the Gamma Quadrant to settle trade arrangements with the Karemma representative, Hanok. As the Dominion disapproves of trading with the Federation, the talks take place secretly in orbit around a gas giant and are mediated by the Ferengi Quark. Hanok is disgusted to learn that Quark has been lining his pockets by imposing fictitious Federation tariffs.
The negotiations are interrupted when a pair of Jem'Hadar ships fire on the Karemma ship. The Jem'Hadar chase the ship into the atmosphere of the gas giant, and the Defiant takes off in pursuit. The Jem'Hadar open fire on the Defiant, crippling it in the turbulent fluorine atmosphere of the planet.
Science Officer Jadzia Dax heads below to try to repair the engines. She is successful but is nearly blown out of the ship when the hull is breached. Dr. Bashir saves her, but they are trapped in a turbolift shaft with a diminishing supply of oxygen and without communication with the rest of the crew, who presume them lost.
One of the Jem'Hadar ships attacks. The Defiant destroys it, but not before it is able to render the Defiant helpless again; Captain Sisko is gravely injured with a concussion. Major Kira tends to him, trying to keep him conscious.
Quark is trapped in the mess hall with Hanok, where a live Jem'Hadar torpedo lodges itself in the hull. Combining their cleverness—and taking a gamble—to defuse the torpedo helps Hanok get over his mistrust of Quark. Dax and Bashir huddle together for warmth; Bashir appreciates the irony that being trapped with Jadzia in his arms was once a fantasy of his. On the bridge, Kira cares for Sisko, telling him a Bajoran fairy tale to try to keep him awake, and regretting that her reverence for him as the prophesied "Emissary" has prevented them from being closer friends. Lt. Cdr. Worf and Chief O'Brien work on putting the Defiant's engines back together; O'Brien helps Worf learn how to tactfully manage the engineering team. The Defiant is eventually able to destroy the second Jem'Hadar fighter and rescue the Karemma crew. Upon returning to Deep Space Nine, Hanok gambles at Quark's bar, and Sisko invites Kira to watch a baseball game with him in the holosuite.