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Doppelganger is the fourth episode of the fourth season of Stargate Atlantis, and the sixty-fourth episode overall.

Starring: Joe Flanigan (Lt. Colonel John Sheppard), Amanda Tapping (Colonel Samantha Carter), Rachel Luttrell (Teyla Emmagan), Jason Momoa (Ronon Dex)

And: David Hewlett (Dr. McKay)

Guest Starring: Jewel Staite (Dr. Jennifer Keller), Claire Rankin (Kate Heightmeyer), David Nykl (Radek Zelenka), Kavan Smith (Major Evan Lorne)

Co-Starring: ...

Contents 1 Plot Overview 2 Notes 3 Arc Advancement 3.1 Happenings 3.2 Characters 3.3 Referbacks 4 Trivia 4.1 The Show 4.2 Behind the Scenes 4.3 Allusions and References 4.4 Memorable Moments 5 Quotes

[edit] Plot Overview

[edit] Notes

[edit] Arc Advancement

[edit] Happenings

[edit] Characters

[edit] Referbacks

[edit] Trivia

[edit] The Show

[edit] Behind the Scenes

[edit] Allusions and References

[edit] Memorable Moments

[edit] Quotes