History Recap / StargateAtlantisS04E04Doppelganger

%%* YourWorstNightmare: See above.

** Sheppard: [[spoiler: [[EvilMeScaresMe Himself]] and his own failures]].

* CallBack: Carter compares the situation initially to the SG-1 first season episode "[[Recap/StargateSG1S1E6ColdLazarus Cold Lazarus]]", where a similar Crystal Entity briefly impersonated O'Neill, although that one wasn't evil. The latter half of the episode also involves technology picked up in the second season episode "[[Recap/StargateSG1S2E4TheGamekeeper The Gamekeeper]]". Keller also mentions Carter being possessed referring to "[[Recap/StargateSG1S2E2InTheLineOfDuty In The Line of Duty]]" from the second season and/or "[[Recap/StargateSG1S4E20Entity Entity]]" from the fourth. Carter also acknowledges the danger of forcing someone to remain awake using stimulants, referring to season ten's "[[Recap/StargateSG1S10E2Morpheus Morpheus]]."

* CallBack: Carter compares the situation initially to the SG-1 first season episode "[[Recap/StargateSG1S1E6ColdLazarus Cold Lazarus]]", where a similar Crystal Entity briefly impersonated O'Neill, although that one wasn't evil. The latter half of the episode also involves technology picked up in the second season episode "[[Recap/StargateSG1S2E4TheGamekeeper The Gamekeeper]]". Keller also mentions Carter being possessed, either referring to in "[[Recap/StargateSG1S2E2InTheLineOfDuty In The Line of Duty]]" from the second season and/or "[[Recap/StargateSG1S4E20Entity Entity]]" from the fourth. Carter also acknowledges the danger of forcing someone to remain awake using stimulants, referring to season ten's "[[Recap/StargateSG1S10E2Morpheus Morpheus]]."

** Several elements of the plot bear strong resembelence to ''Franchise/{{Alien}}'' and to the [[Franchise/ANightmareOnElmStreet Freddy Krueger movies]] -- and the characters are quick to point this out.

* CallBack: Carter compares the situation initially to the SG-1 first season episode "[[Recap/StargateSG1S1E6ColdLazarus Cold Lazarus]]", where a similar Crystal Entity briefly impersonated O'Neill. The latter half of the episode also involves technology picked up in the second season episode "[[Recap/StargateSG1S2E4TheGamekeeper The Gamekeeper]]". Keller also mentions Carter being possessed, either referring to in "[[Recap/StargateSG1S2E2InTheLineOfDuty In The Line of Duty]]" from the second season and/or "[[Recap/StargateSG1S4E20Entity Entity]]" from the fourth. Carter also acknowledges the danger of forcing someone to remain awake using stimulants, referring to season ten's "[[Recap/StargateSG1S10E2Morpheus Morpheus]]."

* BattleInTheCenterOfTheMind: [[spoiler: The final battle between Sheppard and the energy entity that's been killing people by subjecting them to their worst fears]].

* CallBack / ContinuityCavalcade: Carter compares the situation initially to the SG-1 first season episode "[[Recap/StargateSG1S1E6ColdLazarus Cold Lazarus]]", where a similar Crystal Entity briefly impersonated O'Neill. The latter half of the episode also involves technology picked up in the second season episode "[[Recap/StargateSG1S2E4TheGamekeeper The Gamekeeper]]". Keller also mentions Carter being possessed, either referring to in "[[Recap/StargateSG1S2E2InTheLineOfDuty In The Line of Duty]]" from the second season and/or "[[Recap/StargateSG1S4E20Entity Entity]]" from the fourth. Carter also acknowledges the danger of forcing someone to remain awake using stimulants, referring to season ten's "[[Recap/StargateSG1S10E2Morpheus Morpheus]]."

* DontTouchItYouIdiot: Sheppard gets pretty brow-beaten for touching the glowy rock thing.

* DreamWithinADream: [[spoiler: [=McKay=]]]'s death.

* EmotionEater: The entity feeds on the fear of its host - and also, as the episode progresses, the thrill of killing them.

* EvilMeScaresMe: [[spoiler: Crystal!Sheppard rightfully points out that it is the one thing Sheppard's really afraid of, failing and betraying his friends]].

* PowerGlows: The Crystal Entity

* SeenItAll: Carter, see ContinuityCavalcade.

* ShoutOut: Several elements of the plot bear strong resembelence to ''Franchise/{{Alien}}'' and to the [[Franchise/ANightmareOnElmStreet Freddy Krueger movies]] - and the characters are quick to point this out.

* YourWorstNightmare: See above.

* ActingForTwo
* BattleInTheCenterOfTheMind

* EvilTwin: Crystal!Sheppard.

* YourWorstNightmare

* ShoutOut: Several elements of the plot bear strong resembelences to ''Franchise/{{Alien}}'' and to the [[Franchise/ANightmareOnElmStreet Freddy Krueger movies]] - and the characters are quick to point this out.

* CallBack / ContinuityCavalcade: Carter compares the situation initially to the SG-1 first season episode ''[[Recap/StargateSG1S1E6ColdLazarus Cold Lazarus]]'', where a similar Crystal Entity briefly impersonated O'Neill. The latter half of the episode also involves technology picked up in the second season episode ''[[Recap/StargateSG1S2E4TheGamekeeper The Gamekeeper]]''. Keller also mentions Carter being possessed, either referring to in ''[[Recap/StargateSG1S2E2InTheLineOfDuty In The Line of Duty]]'' from the second season and/or ''[[Recap/StargateSG1S4E20Entity Entity]]'' from the fourth. Carter also acknowledges the danger of forcing someone to remain awake using stimulants, referring to season ten's ''[[Recap/StargateSG1S10E2Morpheus Morpheus]].''
* CerebusRetcon: [=McKay=]'s fear of being eaten by the [[SpaceWhale whale-like fish]] in ''[[Recap/StargateAtlantisS02E14GraceUnderPressure Grace Under Pressure]]'' takes on a more serious tone in light of his childhood nightmares from reading ''Moby Dick'', which have never stopped.

* CallBack / ContinuityCavalcade: Carter compares the situation initially to the SG-1 first season episode "Cold Lazarus", where a similar Crystal Entity briefly impersonated O'Neill. The latter half of the episode also involves technology picked up in the second season episode "The Gamekeeper". Keller also mentions Carter being possessed, either referring to in "In The Line of Duty" from the second season and/or "The Entity" from the fourth. Carter also acknowledges the danger of forcing someone to remain awake using stimulants, referring to season eight's "Morpheus."
* CerebusRetcon: [=McKay=]'s fear of being eaten by the [[SpaceWhale whale-like fish]] in "Grace Under Pressure" takes on a more serious tone in light of his childhood nightmares from reading ''Moby Dick'', which have never stopped.

** Keller nearly does so as well, having been compelled to touch it. According to Zelenka, that's how it [[SchmuckBait ropes in it's victims]].

* Dissimile: Sheppard says the glowing crystaline structure "looks like one of those toys you play with when you're a kid". [=McKay=] and Ronon guess "Commodore 64" and "triple barrel shotgun" respectively, which are completely unlike each other and both quite unlike what Sheppard was thinking of, which is a kaleidoscope.

** Also to ''MobyDick'', which [=McKay=] mentions has given him nightmares ever since he was a child.

* CallBack / ContinuityCavalcade: Carter compares the situation initially to the SG-1 first season episode "Cold Lazarus", where a similar Crystal Entity briefly impersonated O'Neill. The latter half of the episode also involves technology picked up in the second season episode "The Gamekeeper". Keller also mentions Carter being possessed, either referring to in "In The Line of Duty" from the second season and/or "The Entity" from the fourth.

* CallBack: Carter compares the situation initially to the SG-1 first season episode "Cold Lazarus." The latter half of the episode involves technology picked up in the fourth season episode "The Gamekeeper."

* DroppedABridgeOnHim: [[spoiler: Dr. Heightmeyer]]

* MonsterClown: one briefly shows up in the boat with Sheppard and [=McKay=]
* PowerGlows

* SeenItAll: Carter

** Also to ''MobyDick''

* ShoutOut: Several elements of the plot bear strong resembelences to ''{{Alien}}'' and to the [[ANightmareOnElmStreet Freddy Cougar movies]] - and the characters are quick to point this out.