McKay is urgently needed back on Earth - Carter has a problem only he can solve. That problem turns out to be named Jeannie Miller, McKay's estranged younger sister. It turns out that she has solved the problem of extracting vacuum energy from a parallel universe in her free time with her daughter's finger paints - the same problem that lead to McKay blowing up a solar system last season. The trouble is she's Happily Married and has absolutely no interest in signing a confidentiality agreement that will make her work the protected property of the US Military.