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Stargate SG-1 provides examples of the following tropes:
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- Paintball Episode: A couple of them, involving the Goa'uld intar training weapon instead of paintball guns.
- Palette-Swapped Alien Food: Played straight in season 4's "Beneath the Surface"; lampshaded the following season, in "Wormhole X-Treme!"
- Panspermia: The Ancients lived on Earth millions of years before humanity evolved, and when they left for the Pegasus Galaxy they re-seeded life throughout the Milky Way and caused a "second evolution" of their form. In season nine, it was revealed that they had not originally evolved on Earth themselves, but had traveled there millions of years before that from their home galaxy.
- Parody Episode:
- The 200th episode, "200", not only parodies everything to do with TV and movie writing and production (ranging from the actors wanting more money to references to Jumping the Shark and a Lampshade Hanging about... Lampshade Hanging). It also parodies everything from The Wizard of Oz, Star Trek, and Farscape to Supermarionation shows (like the original Thunderbirds), zombie movies, teen dramas, and, of course, itself. To actually list all of the parodies including the self-parodying inside jokes would take up this entire page, so if you're interested in hearing all of them, see what the Stargate Wiki's page on it has listed.
- Similarly, the episode to which "200" is a sequel, "Wormhole X-Treme!" from the show's fifth season, is also a Parody Episode, a self-parody as well as parodying both the TV production process and Science Fiction in general.
- Path of Inspiration: "Hallowed are the Ori."
- Pay Evil unto Evil: The Aschen are a race that conquer by slowly sterilising their allies. Because of this, the list of Stargate Addresses they gave them start with a Black Hole and get progressively worse.
- Perfect Pacifist People: The Nox. One of them borders on Technical Pacifist, however. In "Pretense", Lya helps Teal'c to conceal one of the Tollans' ion cannons from Jaffa saboteurs painting them as targets for an orbiting Ha'tak. In response to Sam's query, Lya replies:
Lya: I only hid the weapon. I did not fire it.
- Pet the Dog: Apophis gets a very brief Pet the Dog moment while he is dying in Stargate Command's medical ward, calling for his beloved queen in his final moments. He reverts to evil form when brought Back from the Dead.
- Pet's Homage Name: Carter owns a cat named Schrödinger in some of the later seasons.
- Phlebotinum Dependence: Several examples, all the Goa'uld's fault in one way or another.
- Phlebotinum-Handling Requirements:
- A lot of Goa'uld technology (the kara kesh and the healing device, for instance) requires blood-borne naquadah to activate. Hence why Sam can use it after hosting Jolinar on "In the Line of Duty".
- The fact that Jack has the ATA gene and can thus activate certain Ancient devices (the knowledge repositories and a Puddle Jumper, for instance) is an occasional plot point.
- Physical God: The Goa'uld would very much like their subjects to believe this, when they're really just Sufficiently Advanced Aliens pretending to be gods. The Goa'uld Anubis (who's also the most evil) on the other hand fits this completely, having become a "half-ascended" upper-dimensional Energy Being who manifests in the lower realms to continue being venerated as a divine Evil Overlord.
- Pinned to the Wall:
- An alien device once pinned Jack O'Neill to the wall of the SGC through his shoulder.
- Another time, Baal pinned Jack to a wall with Artificial Gravity and tossed knives (or acid, depending on how he felt like torturing Jack to death that day) at his chest.
- Planetary Nation: Usually played straight, although in most cases this is because there's really only one or two settlements of note (blame the Goa'uld). Two exceptions are Langara, which has at least three major powers, and Tegalus, which has two, and in both cases each are in a Space Cold War with their neighbors.
- Planet of Hats: Many, often remaining identical to their culture of origin from when they were abducted off Earth thousands of years ago.
- Playing Pictionary: Played with. Daniel and Sam are presented with a thermal image of the symbiote inside of Teal'c, and they play dumb:
Daniel: Oh, that's very good! Did you draw that yourself?
Sam: What is it?
Daniel: That... That's a duck, isn't it?
- Point That Somewhere Else: In the two-parter opening of season 7, SG-1 is captured by Anubis' First Prime, Her'ak, who announces they'll be publicly executed. When O'Neill ponders if it's a necessity for this to be in public, Her'ak puts the tip of his staff weapon under his nose, and asks if he'd rather be killed right there. To which O'Neill answers that he's fine with a public execution, while gently pushing away the weapon head — and then he rubs his fingers, since touching the tip of an activated serpent staff barehanded is unadvised.
- Popcultural Osmosis Failure:
- Teal'c in the early seasons. The third episode, "Emancipation", famously ended on the line "What is an Oprah?"
- Vala, who never did get the opportunity that Teal'c did to assimilate and learn about Earth culture, and asked the rest of SG-1 to stop using cultural expressions that she would not understand.
- Daniel Jackson, despite being the one actually from Earth, did not understand what Colonel Mitchell meant when he said they were dealing with a John McClane, and Teal'c had to explain that it was a reference to Die Hard.
- Portal Cut: Objects are only sent through the gate in one piece; when only part of an object is past the event horizon it is held in a hyperspace buffer until the rest of the object enters the gate and the entire thing is transported to the next gate. If the gate were to shut down with part of an object in the buffer that part is lost forever; Major Kawalsky is killed this way in the first season.
- Portal Slam: The Stargate is open as long as the directors say, so it is not unusual for characters to miss the wormhole. Also, when the iris is closed on the receiving end of a wormhole anything that attempts to travel through it suffers a "bugs on a windshield" death. O'Neill coldly orders this done to the character played by Rene Auberjonois, but to be fair he was a white supremacist leader.
- Possession Burnout: Whenever Anubis possesses a host.
- Power of Trust: In "Icon", Daniel spends several months recuperating in the home of Jared Kane and his wife Leda. Over the months, Leda became infatuated with Daniel, particularly since Jared had spent progressively less time at home over the past few years as his political responsibilities grew. When Daniel is trying to get Jared to launch a joint military assault in combination with the SGC, he asks Leda to help persuade him, but Jared has noticed their relationship and demands that Leda answer if she loves Daniel. She hesitates for a moment, then explains that she trusts him.
- Power Parasite: The Goa'uld are a literal version. Sometimes, as Ba'al/Adria demonstrated, the hosts' abilities are too powerful for the Goa'uld to handle, and the possession does not work as a result. By contrast, when they take Unas as hosts, they do so because the Unas are far tougher than humans, but their bodies are more difficult to control and repair.
- Power Perversion Potential: When O'Neill became invisible in the of-doubtful-canonicity episode "200", he spied on Carter while she was taking a shower. Carter knew something was up and asked if he was watching her... he replied "No."
- Power Walk: SG-1 frequently enters the Stargate (and exits the other side) in this manner. In fact, the times they do not Power Walk usually indicate that something is wrong. Subverted early on, as shortcomings in Earth's dialing program cause them to be tossed somewhat violently out the other side. Then they improve the program, and it never happens again until they override a safety protocol that they really should not have.
- Pragmatic Villainy: The System Lord Yu agrees to add Earth to the Asgard Protected Planets Treaty, votes to oppose Anubis's admission into the ranks of the Goa'uld System Lords, spares Teal'c's life after a failed assasination attempt and eventually cooperates with the SGC against Anubis. However, he does all this because he has no interest in our section of the galaxy, he knows Anubis is not going to peacefully integrate into the System Lords, he expects Teal'c to go back and kill the man who planned the assassination attempt and Anubis eventually grows into a threat too large to be faced alone. Daniel Jackson explicitly points out that, despite their past relationship, Yu is not to be trusted or liked, only counted on to make a practical decision not hampered by the normal Goa'uld mindset. In the later seasons he also begins to descend into senility and is steered to a practical decision by his First Prime.
- Precision F-Strike:
- In "A Hundred Days":
Jack: Teal'c, you are one stubborn son of a bitch!
- Jack also calls the entire clergy of the medieval planet ("Demons") sons of bitches when they go to drown Teal'c to see if he's a witch.
- In "Within the Serpent's Grasp":
Klorel: Nothing of the host survives.
Jack: That's bullshit!
- In "Menace", Daniel angrily calls Jack a "stupid son of a bitch" after the latter shoots Reese.
- Precursor Killers: Starting with season four's "Window of Opportunity", the SGC learned that the Ancients suffered from a plague towards the end of their civilization. As the seasons progressed the details were gradually revealed, with the ultimate discovery that the Ori inflicted the plague on the Ancients, inspiring many of them to Ascend to a Higher Plane of Existence, killing the majority of the remaining population and forcing the survivors to flee to the Pegasus Galaxy aboard Atlantis.
- Precursors: Probably holds a record for the most precursors, with three confirmed Precursor races and the implication of many more.
- The Ancients preceded all other life, built the Stargates, and had an undefined relationship with Ancient Rome, potentially teaching them how to effectively build roads and speak Latin. They are either benevolent or neglectful, depending on your point of view and perspective on self-determination.
- The Goa'uld ruled the Earth for approximately five thousand years and introduced the oldest writing systems and organized living, essentially creating human civilization. However, they brutally oppressed humanity during their reign and have done their best to make sure that nobody would build atop the foundation that they left.
- The Asgard preceded human evolution and inspired the Norse pantheon. They did not advance or manipulate human development, but did protect them from the Goa'uld when they could to give humans a chance to make something of themselves.
- The Oannes of "Fire and Water" and the GIANT ALIENS!note (For full effect, say it with a Dutch accent) of "Crystal Skull" have some sort of connection with Babylon and the Maya, respectively, but whether they shaped those societies or simply encountered them was never revealed.
- President Evil:
- Kinsey clearly plans to become one. He possibly achieved it in the Alternate Reality featured in "Moebius".
- Landry in the reality of "The Road Not Taken". Made worse in that he doesn't act any different to the regular Landry.
- Premature Encapsulation: "Tangent" should have been called "Failsafe", and "Failsafe" should have been called "Point of No Return".
- Prepositions Are Not to End Sentences With: Jack apparently considers Her'ak's abuse of the English language a worse torture than the Rod of Anguish.
Her'ak: No matter what you have endured, you have never experienced the likes of what Anubis is capable of!
O'Neill: You ended that sentence with a preposition. Bastard!
- Pride: The Tollan are utterly convinced that they are invulnerable, due to their vast technological superiority that is even beyond that of the Goa'uld. Their arrogance eventually lead them to being wiped out, since they never considered that the Goa'uld might eventually find some way to circumvent their technology.
- Prison Ship: An episode centers on the team finding a crashed prison spaceship.
- Product Placement:
- The early seasons used NEC monitors for desktop computers.
- Samantha Carter uses a Dell Inspiron laptop in the first eight seasons of the show. Though it could have originally been considered as a Red Stapler effect, her switching to a Dell XPS in season nine sealed the deal.
- In one episode in season nine, Col. Mitchell and another Col. Mitchell from another universe are seen sitting at a table drinking Aquafina-brand bottled water.
- Proud Warrior Race Guy: Teal'c of Chulak, First Prime of Apophis. The Jaffa have lived as a warrior society for so long that they use the same word ("kek") for both "weakness" and "death", since if one is weak they might as well be dead. The Jaffa are a surprisingly well-justified version of this concept. Historically they could afford to be a Proud Warrior Race because the Goa'uld filled other necessary social functions, from scientific to spiritual castes. It take a lot of work for the Jaffa to build a purely Jaffa society.
- Psychic Powers: "Rite of Passage", "Metamorphosis", "Prophecy", "Prototype". Also, the Priors of the Ori are given telekinetic powers.
- Public Domain Artifact: Everything from the Sword in the Stone to Thor's Hammer. Usually Imported Alien Phlebotinum of some sort.
- Pulled From Your Day Off: In 'Nemesis' the team gets some leave courtesy of Daniel (and his actor) coming down with appendicitis. Teal'c goes offworld to visit his family, Carter is fiddling with a naquadah reactor, and Jack is about to leave to go fishing when out of nowhere Thor arrives in orbit and beams him up to his ship to fight Replicators.
- Punch! Punch! Punch! Uh Oh...: Done deliberately by Daniel in "The Devil You Know". About to be led away from a chamber after being tortured, he punches one of the Jaffa in the gut (which only annoys the Jaffa), who slugs Daniel into the table across the room... which lets Daniel pick up a comlink he had spotted there a moment before.
- Punctuation Shaker: Lots of Jaffa's names. And Ba'al.
- The Punishment: Stargate SG-1 backstory: To punish Anubis for tricking Oma Desala into ascending him, the Ancients partially descended him, allowing him to keep some but not all of the Ancient knowledge. The latter was punished by allowing him to wander free so she could witness the destructive power she gave him. She ended this by eventually taking matters into their own hands and fighting the former in eternal battle.
- Puppeteer Parasite: The Goa'uld, obviously.
- Putting the Band Back Together: Season nine starts with SG-1 effectively decommissioned as its three remaining members moved on to new positions following the defeat of the Goa'uld: Teal'c had left Earth to help form the new Free Jaffa Nation government, Daniel Jackson was going to Atlantis aboard the Daedalus, and Lieutenant Colonel Samantha Carter had been reassigned to Area 51 for research and development. Lieutenant Colonel Cameron Mitchell, SG-1's new commander, decided to reunite its former members as opposed to building a whole new team.
- Quote-to-Quote Combat:
- A comedic example in The Teaser of "Urgo" when the MALP sends back an image of a tropical beach.
Sam: P4X-884 looks like an untouched paradise, Sir.
Teal'c: Appearances may be deceiving.
Jack: One man's ceiling is another man's floor.
Daniel: A fool's paradise is a wise man's hell.
Jack: Never run with... scissors?
- Another comedic example in "Fallen" when Jack tries to convince a parable- and proverb-loving village elder that the Tau'ri are trustworthy.
Elder: No one can be a friend if you know not whether to trust them.
Jack: Don't judge a book by its cover.
Elder: Enemies' promises were made to be broken.
Jack: And yet, honesty is the best policy.
Elder: He who has too many friends has none.
Jack: Ahh, but, birds of a feather.
Elder: I'm unfamiliar with that story. What lesson does it teach?
Jack: It has to do with flocking, and togetherness, and to be honest I'm not so familiar with the particulars myself.
- Daniel has a habit of countering the Ori Priors' dramatic quoting of the Book of Origin with yet more quotes from the same document. A more serious instance happens after the Supergate opens in "Camelot" and the Ori warships arrive. They send a text-only message to the allied fleet gathered to stop them, a quote from the Book of Origin that basically translates to "And those who are prideful and refuse to bow down shall be laid low and made onto dust." Daniel shoots back with, "Then did Tileus say to the people of the low plains: 'seek not wickedness amongst your neighbors lest it find purchase in your own house.'" Unfortunately this battle is decided by firepower rather than quotes.
- Cam does something similar on occasion, except he uses The Bible instead of the Book of Origin.