In Atlantis' control room, the Daedalus' IFF was detected, indicating that the ship was in close proximity to the planet. However, the Daedalus was supposed to be on Earth at the time. Because of this, Lt. Colonel John Sheppard's team was sent up to the ship to, via Puddle Jumper, to investigate. Upon their arrival, they discovered the ship was actually from an alternate reality and used an Alternate reality drive to get to its current location. The ship had been continuously jumping between realities and then did so again shortly after their arrival. The second reality that the team jumped into was where this battle was taking place. (SGA: "The Daedalus Variations")