--> ''I have fed upon countless thousands of humans and Lanteans, and even my own crew, and I will feed upon you before this day is done.''
---> -- '''Ancient Wraith'''

Sheppard, [=McKay=], and a couple of up and coming young scientists take a romp around their local solar system. This serves the dual purposes of checking out an Ancient defense satellite discovered by Dr. Gall and giving [=McKay=] some driving lessons out in space where there's nothing much to hit. When they get to the satellite, which is huge but apparently burnt out, they pick up a faint Wraith distress signal from the planet's surface, and manage to extract permission from Weir to go and investigate.

It turns out to be a Wraith supply ship, shot down by the satellite in the last days of the war. Finding no life signs except some ubiquitous glowy bug things, they decide to split the party: Gall and Abrams catalogue the hold full of cocooned dead people while Sheppard and [=McKay=] head off to find the bridge and any information stored in the computers. And so the solitary Wraith survivor comes out of hibernation to take advantage of this snack that has been dropped in his lap.

The Wraith eats Abrams immediately, but cocoons Gall and starts dragging him off to another part of the ship, with Sheppard and [=McKay=] in hot pursuit. He feeds off of Gall but leaves him alive, thereby discovering the location of the cloaked Puddle Jumper. When Sheppard and [=McKay=] catch up, he's already gone. [=McKay=] stays behind with Gall, who is still mostly paralyzed, while Sheppard takes off after the Wraith, hoping to beat him to the Jumper.

He's too late. The Wraith has captured the Jumper, and its weapons, but cannot fly it because he lacks the Ancient gene. The two of them begin a sort of cat and mouse game of dueling strategy and trading trash talk. Unfortunately for Sheppard, this ancient Wraith seems to be able to take a lot more punishment than his modern counterparts, including all of the rounds in Sheppard's P-90 and a grenade to the face. Sheppard is wounded, out of ammo, and continually harassed by the glowy bug things, who seem inordinately interested in his chocolate.

When it seems that the Wraith is about to get him, he is unexpectedly rescued by [=McKay=], who has uncharacteristically leapt into the fight. Having two targets momentarily confuses the Wraith, long enough for Ford to suddenly appear in a second Puddle Jumper. Sheppard sticks his last chocolate bar to the Wraith, attracting a horde of glowy space bugs, and tells Ford to "shoot at the target with the biggest life-sign!" This, at last, seems to finally put the Wraith down for good, and [=McKay=] is able to fix the Puddle Jumper and drive them home.

!!Tropes

%%* BadassBoast:
* CalmingTea: [=McKay=]'s proposed solution to Gall's problems:
-->'''[=McKay=]:''' All you need is a [[ComfortFood good meal]], a pot of tea, and to stop talking.
* TheCavalry: Ford and his team in the second Puddle Jumper.
* CharacterDevelopment: Gall notes that [=McKay=] has changed -- he wants to go join Sheppard in the fight, rather than staying where it's safe. This might or might not have something to do with getting tortured in [[Recap/StargateAtlantisS01E10TheStorm the previous episode.]]
* ChekhovsGun:
** Literally. While trawling through the jumper, the wraith finds a pistol and throws it aside. After being shot, he plays dead long enough for Sheppard to come close before picking up the gun and taking him by surprise.
** [=McKay=] scans one of the native firefly-like creatures and notes it's giving off an unusually strong lifesigns reading. Though it isn't directly stated, the fact that the Wraith is using them as a food source is implied to be responsible for his almost ridiculous ability to regenerate from damage.
* ContinuityNod: Gall points out the Ancient Satellite's as large as a Goa'uld Mother Ship.
* ExplainExplainOhCrap: [=McKay=] muses out loud for a few moments on the impossibility of any Wraith having survived to the present from the original crash, until he realizes that based on his mental math there ''could'' be survivors. He and Sheppard promptly turn back to reach Abrams and Gall as quickly as possible, but they're still too late.
%%* GhostShip
* GutFeeling: Dr. Weir knows to send a rescue mission before the team is even late reporting in, justifying it as "intuition" when Ford points out it's an early call.
* InstantlyProvenWrong: Sheppard complains that [=McKay=] needs to focus on flying straight in the beginning of the episode. [=McKay=] protests that he's doing just fine, and the Jumper immediately pulls up a display showing the projected course and the Jumper wildly swerving back and forth along it.
* IWillOnlySlowYouDown: Gall [[HeroicSuicide shoots himself]] so that [=McKay=] will go out and join the fight.
* JugglingLoadedGuns: [=McKay=]
* KillSat: The Ancient defense satellite.
* LastOfHisKind: Sheppard tells the Wraith he is the last, that the Ancients won the war. Though it should be noted that the Wraith immediately calls bullshit on this statement.
* LetsSplitUpGang: Sheppard leaves [=McKay=] with the injured Gall in order to hunt down the Wraith. The scientists aren't happy about that, but Sheppard points out that they can't afford to risk the Wraith taking the Jumper- even if he can't fly it, he could access the comms and call other Wraith.
* NoOntologicalInertia: Averted in the case of Dr. Gall, despite [=McKay=]'s protestations to the contrary.
* RasputinianDeath: The surviving Wraith on the planet manages to regenerate from assault with a full P-90 magazine, dozens of 9mm rounds, and a ''grenade'' in his face. It takes a Lantean drone fired from a Jumper to finally kill him.
* ShoutOut:
** To ''Series/StarTrekTheOriginalSeries''.
--->'''Sheppard:''' He's aboard my ship.\\
'''[=McKay=]:''' What are you, [[TheKirk Captain Kirk]]?
** The episode title is a reference to the film ''Film/TheDefiantOnes''.
* SoleSurvivor: The shipwrecked Wraith.
* SoundOnlyDeath: Gall's suicide.
* ThrowingTheDistraction: Sheppard sets a smoke flare and fires a couple shots to get the Wraith to leave the Jumper and investigate it. Unfortunately, the Wraith is smart enough to set a force field before leaving the Jumper.
* TookALevelInBadass: Gall points out that [=McKay=] has done this, that he has stopped being a coward since he arrived in Atlantis.
* TortureAlwaysWorks: Dr. Gall starts off defiant when captured by the Wraith, noting that he's dead either way. The Wraith counters that while he will drain him dry, he doesn't have to do it all at once, and Gall cracks after a partial feeding.