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* ArmedAltruism: As soon as Jack O'Neill frees Major Davis, he gives him his pistol.
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* DiagnosisKnowingTooMuch: What the aliens impersonating the SG-1 personnel attempt, in a variation, to do with Carter and Teal'c. Alien!Fraser claims that Teal'c went berserk because of the chemical spill, and they had to restrain him for his own safety. Carter, after trying to alert Col. Maybourne, is met by two of the aliens impersonating Daniel and O'Neill, who also make the same claim to her, that she has been affected by the chemical.
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* AlienBlood: The aliens are shown to bleed some kind of viscous blue substance.
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* AlienBlood: The aliens are shown to bleed some kind of viscous blue pearlescent purple substance.
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* ArtisticLicenseChemistry: The aliens claim a chemical spill of tetrachloroethylene in the SGC facility to help cover, claiming exposure to the chemical can cause delusions and hallucinations. Tetrachloroethylene is commonly used in cleaning solutions, and it is not known to cause hallucinations.
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Trope deprecated per TRS
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* FamousLastWords: Subverted: the alien commander gives what seems to give a lengthy speech of some kind before self-destructing; however, since the holographic impersonator is disabled, all that we hear is totally incomprehensible.
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* ImpostorExposingTest: Maybourne cuts his hand in front of Carter to prove to her that his blood is human.
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* ImpostorExposingTest: Maybourne cuts his hand in front of Carter to prove to her that his blood is human. It had earlier been established to the audience that the alien blood also looks red provided their holographic disguise is still in effect, so this demonstration actually doesn't prove anything, [[DeconstructedTrope but neither of them know that]].
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* HiddenDepths: Colonel Maybourne starts out being his typical ObstructiveBureaucrat self, but after he witnesses concrete evidence that Carter is telling the truth about the invasion, he immediately becomes much more helpful. He even leads the spec ops team that retakes Cheyenne Mountain at the end. There's a reason the NID entrusts him with so many black operations, after all.
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* HiddenDepths: Colonel Maybourne starts out being his typical ObstructiveBureaucrat self, but after he witnesses concrete evidence that Carter is telling the truth about the invasion, he immediately becomes much more helpful. He even leads the spec ops team that retakes Cheyenne Mountain at the end. There's a reason the NID entrusts him with so many black operations, after all.it would seem.
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* CaptureAndReplicate: The invaders imprison personnel and use them to create holographic disguises. The prisoners are kept alive to allow the aliens to mimic their normal behavior via {{technobabble}}.
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* HiddenDepths: Colonel Maybourne starts out being his typical ObstructiveBureaucrat self, but after he witnesses concrete evidence that Carter is telling the truth about the invasion, he immediately becomes much more helpful. He even leads the spec ops team that retakes Cheyenne Mountain at the end. There's a reason the NID entrusts him with so many black operations, after all.
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* FamousLastWords: Subverted: the alien commander gives what seems to give a lengthy speech of some kind before self-destructing; however, since the holographic impersonator is disabled, all that we hear is totally incomprehensible.
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After returning from a mission, the team is informed that there has been a dangerous chemical spill on base and taken to the infirmary; sometime later, Carter and Teal'c wake up to find the SGC in the midst of a full-scale infiltration by alien forces. Carter manages to escape, and with nowhere else to go, turns to Maybourne for assistance.
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!!"Foothold" provides examples of the following tropes:
* AlienBlood: The aliens are shown to bleed some kind of viscous blue substance.
* AlienInvasion: Of the "infiltration" variety. It's revealed at the end of the episode that the aliens came through the gate already impersonating another SG team and slowly took over the rest of the base personnel from there.
* AllWebbedUp[=/=]UnwillingSuspension: Those taken captive are strung up from the ceiling in some sort of web-like material so that the aliens can impersonate them unimpeded.
* GlamorFailure: Carter discovers that a certain sound frequency will interrupt the holographic projectors used by the aliens, allowing them to be seen for what they really are.
* HolographicDisguise: The aliens use this to disguise themselves as the SGC personnel. Carter later uses one of the devices to impersonate the alien impersonating Daniel, allowing her to sneak back onto the base.
* HumanoidAliens: The aliens are vaguely humanoid in shape and size, but are otherwise not remotely human looking at all.
* ImpostorExposingTest: Maybourne cuts his hand in front of Carter to prove to her that his blood is human.
* InstantSedation: When the team is taken to the infirmary at the beginning of the episode, "Fraiser" gives them a shot that knocks them out almost instantly.
* OneManArmy: Teal'c manages to take out about half the base before he's finally captured.
* OutOfCharacterAlert: A downplayed example; Carter seems to forget that she's still impersonating Daniel when she finds O'Neill, who is noticeably thrown by her calling him "sir" and "Colonel". Once she realizes what she's done, however, she is able to quickly remove the disguise and reveal her true identity.
* OvertRendezvous: Carter has Maybourne meet her in a very public outdoor cafe to discuss an ongoing alien invasion.
* PetTheDog: Maybourne gets a moment at the end where he gives Carter all credit for saving the day and commends her actions.
* PsychicLink: The aliens have technology that maintains a psychic connection with the person they're impersonating, allowing them to convincingly copy mannerisms and giving them access to all the knowledge of the person they're supposed to be.
* TheReasonYouSuckSpeech: Carter gets frustrated with Maybourne's initial refusal to believe her and isn't shy about letting him know exactly what she thinks of him.
-->'''Carter:''' Maybourne, you are an ''idiot'' every day of the week. Why couldn't you just take one day off?!
* SelfDestructMechanism: The aliens blow themselves up once they realize their plans have been thwarted.
* TeethClenchedTeamwork: Between Carter and Maybourne. She clearly isn't thrilled about having to contact him, but since her own chain of command is compromised she doesn't know who else to turn to.
* WouldHitAGirl: O'Neill sucker-punches the alien impersonating Fraiser, though he's clearly unnerved about doing so.
-->'''O'Neill:''' That was weird.
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!!"Foothold" provides examples of the following tropes:
* AlienBlood: The aliens are shown to bleed some kind of viscous blue substance.
* AlienInvasion: Of the "infiltration" variety. It's revealed at the end of the episode that the aliens came through the gate already impersonating another SG team and slowly took over the rest of the base personnel from there.
* AllWebbedUp[=/=]UnwillingSuspension: Those taken captive are strung up from the ceiling in some sort of web-like material so that the aliens can impersonate them unimpeded.
* GlamorFailure: Carter discovers that a certain sound frequency will interrupt the holographic projectors used by the aliens, allowing them to be seen for what they really are.
* HolographicDisguise: The aliens use this to disguise themselves as the SGC personnel. Carter later uses one of the devices to impersonate the alien impersonating Daniel, allowing her to sneak back onto the base.
* HumanoidAliens: The aliens are vaguely humanoid in shape and size, but are otherwise not remotely human looking at all.
* ImpostorExposingTest: Maybourne cuts his hand in front of Carter to prove to her that his blood is human.
* InstantSedation: When the team is taken to the infirmary at the beginning of the episode, "Fraiser" gives them a shot that knocks them out almost instantly.
* OneManArmy: Teal'c manages to take out about half the base before he's finally captured.
* OutOfCharacterAlert: A downplayed example; Carter seems to forget that she's still impersonating Daniel when she finds O'Neill, who is noticeably thrown by her calling him "sir" and "Colonel". Once she realizes what she's done, however, she is able to quickly remove the disguise and reveal her true identity.
* OvertRendezvous: Carter has Maybourne meet her in a very public outdoor cafe to discuss an ongoing alien invasion.
* PetTheDog: Maybourne gets a moment at the end where he gives Carter all credit for saving the day and commends her actions.
* PsychicLink: The aliens have technology that maintains a psychic connection with the person they're impersonating, allowing them to convincingly copy mannerisms and giving them access to all the knowledge of the person they're supposed to be.
* TheReasonYouSuckSpeech: Carter gets frustrated with Maybourne's initial refusal to believe her and isn't shy about letting him know exactly what she thinks of him.
-->'''Carter:''' Maybourne, you are an ''idiot'' every day of the week. Why couldn't you just take one day off?!
* SelfDestructMechanism: The aliens blow themselves up once they realize their plans have been thwarted.
* TeethClenchedTeamwork: Between Carter and Maybourne. She clearly isn't thrilled about having to contact him, but since her own chain of command is compromised she doesn't know who else to turn to.
* WouldHitAGirl: O'Neill sucker-punches the alien impersonating Fraiser, though he's clearly unnerved about doing so.
-->'''O'Neill:''' That was weird.
