Stargate Atlantis

In Stargate Atlantis, what season and episode ends with John Shepherd fighting himself?

I am looking for a specific episode of Stargate Atlantis. I can't remember what season or episode it is, but at the end John Shepherd has an action packed fight against himself. Does anyone know?

Could it be "Doppelganger" (Season 4, Episode 4)?

John Sheppard inadvertently activates a crystalline alien entity, which uses his form to induce nightmares in others. The final showdown occurs between Sheppard and Nightmare-Sheppard...

> http://stargate.wikia.com/wiki/Doppelganger
> http://www.gateworld.net/atlantis/s4/404.shtml

I hoped I helped!

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