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{{Ortografía}} {{Infobox Episode
| name=Ripple Effect
| image=[[File:A Room of Alternate Samantha Carters.jpg|250px]] {{caption|A room full of alternate Carters.}}
| series=[[Stargate SG-1]]
| episode=[[SG-1 Season 9|9.13]]
| production=913
| airdate=[[January 20]], [[2006]]
| story=[[Brad Wright]]<br>[[Joseph Mallozzi]]<br>[[Paul Mullie]]
| writer=[[Joseph Mallozzi]]<br>[[Paul Mullie]]
| director=[[Peter DeLuise]]
| guests=[[Teryl Rothery]] as [[Dr.]] [[Janet Fraiser#Alternate realities|Janet Fraiser]]<br>[[JR Bourne]] as [[Martouf#Alternate realities|Martouf]]<br>[[Gary Jones]] as [[CMSgt.]] [[Walter Harriman]]<br>[[Bill Dow]] as [[Dr.]] [[Bill Lee]]<br>[[Lexa Doig]] as [[Dr.]] [[Carolyn Lam]]<br>[[Dan Shea]] as [[MSgt.]] [[Sylvester Siler]]<br>[[Trevor Devall]] as voice of [[Kvasir]]
| preceded_by="[[Collateral Damage]]"
| followed_by="[[Stronghold]]"
}}
{{SG1-9}}
'''"Ripple Effect"''' is the thirteenth episode of the [[SG-1 Season 9|ninth season]] of ''[[Stargate SG-1]]''.

==Synopsis==
[[SG-1]] returns early from a routine mission, believing differently than [[Major General]] [[Henry Landry]] key details about their mission. Then the real SG-1 returns at their correctly scheduled time. Soon, other SG-1s from [[Alternate reality|alternate realities]] begin arriving and the real SG-1 must find a way to get them back to their own realities, but not all is as it seems when the first alternate team have plans of their own.

==Plot==
An unscheduled offworld activation has summoned [[Major General]] [[Henry Landry]] and [[Dr.]] [[Carolyn Lam]] to the control room. As the [[Stargate]] prepares to open, there is a brief, blinding flash of light and an odd noise. [[SG-1]], dressed in their black uniforms, comes through the gate. Landry notes that they are early.

A briefing follows, during which a number of discrepancies come to light. Before they can be resolved, there is an offworld activation. SG-1 (in green uniforms) arrives right on schedule. Landry orders Lam to investigate. They conclude that both teams are really SG-1, but that the facts indicate that the green SG-1 is ours. (The black team, for example, believes that the [[Tok'ra]] [[Selmak]] is still alive.) Back in the conference room, Landry and the green team discuss the situation.

In need of more information, a series of interviews takes place. Black team [[Daniel Jackson#Alternate realities|Jackson]] is interviewed by green team [[Lt. Colonel]] [[Cameron Mitchell]]; Landry speaks with the black team [[Cameron Mitchell#Alternate realities|Mitchell]]; green team [[Dr.]] [[Daniel Jackson]] takes notes in his discussion with the black team [[Teal'c#Alternate realities|Teal'c]]. Meanwhile, green team [[Lt. Colonel]] [[Samantha Carter]] and black team [[Samantha Carter#Alternate realities|Carter]] talk science as they try to sort out what caused this problem.

As the green team Carter briefs Landry and the rest of the green team SG-1 -- she suggests the beachhead [[black hole]] the [[Ori]] tried to create is involved in bringing another SG-1 here from an [[alternate reality]]—there is another unscheduled offworld activation. Assembled in the control room, the green team and Landry watch as another SG-1 team, taking fire and dressed in blue tiger camo, rush through the gate. Landry orders all gate travel restricted.

While [[Dr.]] [[Bill Lee]] discusses the situation with the green team Carter, the black team Carter joins them. As they work, more SG-1 teams arrive. Eventually, Landry takes the green team Jackson and [[Teal'c]] to a room where [[Dr.]] [[Janet Fraiser#Alternate realities|Janet Fraiser]] awaits them. They are stunned, as our universe's Fraiser was killed two years ago. She reveals that her Earth is suffering from the [[PRIOR2 virus|Ori plague]]. Also on this team is [[Martouf#Alternate realities|Martouf]], who Landry takes to see the green team Carter, now working on the problem with at least 16 other Carters. As green team Carter sits talking to Martouf—who she was forced to kill several years ago, black team Carter approaches and delineates the problem and a potential solution.

The green SG-1 and Landry confer with [[Kvasir]], who comes in [[Thor]]'s place, about a risky plan that involves using ''[[Prometheus]]'' to close the breach in space that has diverted so many SG-1 teams. Unfortunately, all of the teams will then be stranded permanently.

Fraiser visits Landry to ask for more time to find a better solution. Landry feels sympathetic but at the same time believes that he must act first and foremost to protect his own reality.

[[File:PrometheusBlackHole.jpg|thumb|right|The [[Prometheus]] at a [[Black hole]]]]
Staffed only by the green and black SG-1s, the ''Prometheus'' heads off. But the black team soon launches a plot to take command of the ship by breaking into the armory. Armed with [[Zat'nik'tel]]s, they capture the green team Mitchell and take him to the bridge just as the ''Prometheus'' is in position to launch its [[Asgard]]-primed weapon to close the breach.

The green team is taken to a brig while the black team re-routes the ''Prometheus'' to [[Atlantis]] in the [[Pegasus]] [[Galaxy]]. Their intent is to steal Atlantis' [[Zero Point Module]] and drop off the green team on a habitable [[planet]]. As soon as Teal'c destroys the camera in the cell, the green team hatches a counterplot.

Green team Mitchell asks to speak with the black team Mitchell. The black team feels that the Atlantis ZPM is only used to power the Stargate for one-way travel to the Pegasus Galaxy. They need the ZPM to power the [[Ancient]]s' [[Antarctic outpost]], suggesting they do not fully understand the situation on Atlantis and the need for the ZPM to [[cloak]] the city from the [[Wraith]]. Green team Mitchell realizes that the black team created the entire situation to come to our universe deliberately—and that they already have a way home.

Once the green team Mitchell is back in the cell with the green team, Carter hotwires the door and she and Jackson set off for the engine room, while Mitchell and Teal'c head for an armory. As they try to open the armory door, the black team Jackson and black team Teal'c show up and prepare to take green team Teal'c captive once more. It's a trap: the green team Mitchell is really the black team Mitchell.

But before they can touch Teal'c, green team Carter and green team Jackson arrive and Zat black team Jackson and Teal'c. Our SG-1 anticipated the trap from their other selves, and set one of their own. The black team is taken to a holding cell where the door cannot be hotwired; black team Mitchell is dressed only in T-shirt, underwear and boots. Green team Mitchell, similarly clad, locks the door on them.

Green team Carter works out a plan for returning the many SG-1s to their respective universes, and upon the return of the ''Prometheus'' to [[Earth]] orbit she requests the use of an [[Asgard directed energy weapon]]. They fire it into the open Stargate, recreating the conditions the black team used to cause the breach.

Starting with the black team, the teams are sent back to their realities. On the ramp, the black team Mitchell stops and enigmatically tells the green team Mitchell, "When the time comes, cut the green one."

Finally, the last team assembles. After Carter, Jackson, and Teal'c share an emotional goodbye with Martouf and Janet, Landry provides them with the cure to the Ori plague and the team heads home to save its Earth.

==References==
[[Alternate reality]]; [[Amaterasu#Alternate realities|Amaterasu]]; [[Antarctica]]; [[Antarctic outpost]]; [[Anubis#Alternate realities|Anubis]]; [[Asgard]]; [[Asgard directed energy weapon]]; [[Atlantis]]; [[Ba'al]]; [[Bacon]]; [[Battle of Dakara]]; [[Black hole]]; ''[[Book of Origin]]''; [[Bra'tac of Chulak#Alternate realities|Bra'tac]]; [[Jacob Carter#Alternate realities|Jacob Carter]]; [[Chulak]]; [[Cloak]]; [[Cloning]]; [[Coffee]]; ''[[Daedalus]]''; [[Dakara]]; [[DNA]]; [[Emma]]; [[Entropic cascade failure]]; [[Gamma ray]]; [[Goa'uld]]; [[Heimdall]]; [[K'tau]]; [[Major General]] [[Jonathan J. O'Neill#Alternate realities|Jack O'Neill]]; [[Orange juice]]; [[Ori]]; [[Ori plague outbreak on Earth#Alternate realities|Ori plague outbreak on Earth]]; [[P3W-451]]; [[P3X-666]]; [[P4R]]; [[PX7-455]]; [[Pegasus]]; [[PRIOR2 virus]]; ''[[Prometheus]]''; [[Quantum Mirror]]; [[Quantum physics]]; [[Replicator]]s; [[Selmak#Alternate realities|Selmak]]; [[SG-2]]; [[SG-3]]; [[Sodan]]; [[Solar flare]]; ''[[Star Trek]]''; ''[[Superman]]''; [[Supernova]]; [[Thor]]; [[Time dilation device]]; [[Time dilation field]]; [[Tok'ra]]; [[Amy Vanderburg]]; [[Senior Airman]] [[Simon Wells#Alternate realities|Simon Wells]]; [[Wraith]]; [[Zat'nik'tel]]; [[Zero Point Module]]

==Notable Quotes==
'''Carter''': Me and myself, I suppose. Me and the other Samantha Carter.<br />
'''Mitchell''': Right, finally someone who can keep up with you, huh?<br />
'''Carter''': Yup.

'''Mitchell''': You know, I read all the mission reports on the Asgard. They're not what I expected.<br />
'''Carter''': What were you expecting?<br />
'''Mitchell''': Well, ''pants ''for one.

'''Jackson''': Okay, say for example, we accept this is an ''alternate'' SG-1 from a parallel universe ... how did they get here?<br />
'''Carter''': I got nothing.<br />
''(Everyone looks at her, amazed she doesn't have a theory)''<br />
'''Carter''': ''Yet.''

'''Landry''': But we've had teams gate in from locations on the other side of that black hole in our universe, why weren't they affected?<br />
'''Mitchell''': One more stupid question - oh, Sir, yours was fine, mine is stupid.

'''Landry''': I'm willing to make the occasional exception, but I'm not planning to turn this base into the Grand Central Station of the multiverse.

'''Alternate Jackson''': Where's the crew?<br />
'''Mitchell''': You're looking at it.<br />
'''Teal'c''': Given the dangers we may face, it was decided that we would proceed alone.<br />
'''Alternate Mitchell''': So if this plan goes FUBAR we're the only ones that go down with the ship?<br />
'''Jackson''': Well, there's plenty more where we came from, right?

==Notes==
{{source images}}
*This episode was originally entitled "Convergence", but it was changed because it sounded too similar to a ''[[Stargate: Atlantis]]'' episode entitled "[[Conversion]]".
*This episode was overly long, so many scenes had to be edited and even cut for time. [[Joseph Mallozzi]] posted script sections of all cut scenes in his producer installment on [http://www.gateworld.net/sg1/s9/making/913.shtml Gateworld].
*[[Dr.]] [[Daniel Jackson]] mentions that he misses [[Thor]]. This is most likely a reference to [[Michael Shanks]]' voicing of Thor.
*The Black SG-1's [[Lt. Colonel]] [[Cameron Mitchell#Alternate realities|Cameron Mitchell]] refers to the events of "[[Out of Mind]]" and the ''[[Stargate: Atlantis]]'' episode "[[Home]]", the Black SG-1's [[Teal'c of Chulak#Alternate realities|Teal'c]] refers to those of "[[Reckoning, Part 1]]", "[[Reckoning, Part 2]]" and "[[Threads]]", the Black SG-1's [[Samantha Carter#Alternate realities|Samantha Carter]] refers to those of "[[A Matter of Time]]" and "[[Red Sky]]" and the alternate [[Janet Fraiser#Alternate realities|Janet Fraiser]] refers to those of "[[Heroes, Part 2]]", "[[The Fourth Horseman, Part 1]]" and "[[The Fourth Horseman, Part 2]]". This indicates that the events of all of those episodes also occurred in their respective realities. However, in the case of the latter three episodes, the relevant events proceeded differently.
*One of the deleted scenes shows Black [[SG-1]]'s [[Dr.]] [[Daniel Jackson#Alternate realities|Daniel Jackson]] having second thoughts on stealing the [[Zero Point Module]]. This is important as this indicated that Black SG-1 aren't evil, just driven to desperation.
*Mitchell makes a reference to {{WPS|Bizarro}} at the start of the episode, "Why didn't we end up on an alternate PX7 when we gated through to check on Bizarro SG-1's…"
*This episode is the second episode with SG-1 members from multiple realities in the same reality. In the first episode, "[[Point of View]]", the [[Dr.]] [[Samantha Carter#Alternate realities|Samantha Carter]] from the other reality suffers from [[Entropic cascade failure]]—the result of two Carters in one universe. However, in "Ripple Effect", it doesn't seem to affect any of the SG-1 members from the other realities. It is speculated that the reason for this is that all the SG-1 teams are from realities that are relatively "close" to ours.
*When the black SG-1 dial in, the 7th Chevron is not Earth's Point of Origin
*On the ''[[Prometheus]]'', [[Lt. Colonel]] [[Cameron Mitchell]] mentions that the black SG-1 don't have beards so they're not evil, which is a reference to the ''[[Star Trek]]'' episode "[[w:c:memoryalpha:Mirror, Mirror (episode)|Mirror, Mirror]]".
*This is the first and only episode of the series to feature a version of [[Dr.]] [[Daniel Jackson#Alternate realities|Daniel Jackson]] from an [[alternate reality]]. However, versions of the character from different [[alternate timeline]]s had previously appeared in the Season Four episode "[[2010 (episode)|2010]]" and the Season Eight finale "[[Moebius, Part 1]]" and "[[Moebius, Part 2]]".
*At the end of the episode, when alternate [[Martouf#Alternate realities|Martouf]] and alternate [[Janet Fraiser#Alternate realities|Janet Fraiser]]'s team is departing, Carter asks, out of curiosity, why she isn't on their SG-1. To which Fraiser answers that she was on maternity leave. This is a tongue-in-cheek reference to [[Vala Mal Doran]]'s temporary membership of SG-1 while [[Amanda Tapping]] herself was on maternity leave from the show.
*This episode marks the final appearances of [[Teryl Rothery]] ([[Janet Fraiser]]) and [[J. R. Bourne]] ([[Martouf]]/[[Lantash]]) on the series.

==Goofs==
*In the 41st minute of the episode, when the gate is being dialed for the last alternate team to leave, the 6th chevron lights up while the inner ring is still rotating and the 7th chevron is already lit.
*Surely [[Major General]] [[Henry Landry]] must have known that something was not right when [[SG-1]] returned in different uniforms to the ones they left in.
*[[Lt. Colonel]] [[Samantha Carter]] states in this episode, that normally, the travel between two gates takes only a fraction of a second. Most other episodes show, that objects take up to 5 seconds to reach their destination.
*In the 42nd minute of the episode, when the last team is leaving you can hear the sound of 5 persons stepping through the gate, but the team is only formed by 4 persons: Janet, Daniel, Mitchell and Martouf

==First appearance==
===Character===
*[[Kvasir]]

==In other languages==
*'''French:''' Effet Domino ''(Domino Effect)''
*'''Italian:''' Universi Paralleli ''(Parallel Universes)''
*'''Spanish:''' Efecto Onda ''(Ripple Effect)''
*'''Czech:''' Rezonanční efekt ''(Resonance Effect)''
*'''German (DVD/TV):''' Der Ripple-Effekt ''(The Ripple Effect)'' / Parallelwelten ''(Parallel Worlds)''

==External links==
*{{SciFi|stargate/episodes/season09/0913/|Ripple Effect}}
*{{MGMsite|view/episode/2670/index.html|Ripple Effect}}
*{{GateWorld|sg1/s9/913.shtml|Ripple Effect}}
*{{Solutionswiki|9.13_%22Ripple_Effect%22_Episode_Guide|Ripple Effect}}

{{wikipedia|Ripple Effect (Stargate SG-1)}}
[[Category:Episodes featuring alternate realities]]
[[Category:Story arcs/Tok'ra|9.13]]
[[Category:Story arcs/Asgard|9.13]]