 Episode writer McCullough described the episode as a one-off "wild romp", with much use of visual effects. The episode follows John Sheppard and his team, who investigates the mysterious appearance of the Daedalus over Atlantis, where they soon find the ship is from a parallel universe and makes its way through various alternate realities with an "alternate reality drive". Stuck on the Daedalus, the team seeks to find a way to return, while they run into contact with a newly introduced alien race and find the ship's new drive is slowly burning out, and they could be stranded in another universe forever.
