Millers Crossings : STARGATE ATLANTIS SEASON FOUR ....

After being reunited with his estranged sister Jeannie a year ago ("McKay and Mrs. Miller"), Rodney has been keeping up a correspondence with her back on Earth. Unfortunately, certain powerful people are aware of this -- and use it to lure Jeannie into a trap. Rodney goes looking for her, and the two find themselves captives.
Rodney wakes up in a laboratory on Earth with Jeannie, and the two meet the man behind all of this: Henry Wallace, the president of Devlin Medical Technologies. His company gets a lot of government contracts, and is one of their primary resources for integrating alien technologies acquired by the Stargate Program into Earth's medical technology. Wallace therefore has only the lowest level of access to information -- but after a few too many astounding break-throughs by the military, he has managed to find out all about the S.G.C., Atlantis ... and Rodney McKay.
Soon Wallace shows the two brilliance scientists why he's brought them here: his daughter Sharon, a young woman suffering from leukemia. McKay isn't sure what he wants the two of them to do -- neither are medical doctors. Wallace explains that Sharon has been given prototype nanites to try and heal her, but they are doing more harm than good. She is dying.Rodney and Jeannie are experts on their coding ... but the problems haven't been worked out yet.
The rest of the Atlantis team, of course, won't take Rodney's disappearance lying down. Sheppard and Ronon visit Earth, where they work with Stargate Command and N.I.D. Agent Malcolm Barrett to try and find their missing people. 

PRODUCTION

"The director's cut of 'Miller's Crossing' came in a little long which will probably mean a scene or two not making the cut -- but hopefully finding their way onto a future Deleted Footage Special Feature. By the way, guest star Steven Culp is terrific in this one."
(Executive producer Joseph Mallozzi, in a post at his blog)"We've got Kate [Hewlett] back, which I know is going to make a lot of fans happy. She had a terrific repartee with Steven Culp, who's done a million things, but is probably best known for playing one of the husbands on Desperate Housewives. In this Atlantis episode he plays a wonderful villain who isn't really a villain, but more of a guy who does all the wrong things for the right reasons.
"So Steven and Kate got on like a house on fire, and we all had a great time working on this episode. I think the hardest part was keeping a straight face. Kate, Steven and I just lost it on numerous occasions, and we were doing really serious stuff, too. Jeannie is just a constant source of frustration for Rodney. There are some hysterical scenes where the two of them are trying to escape from a building, and it's like watching a British comedy because they're snapping back and forth at each other, arguing about the wrong things at the wrong time. Kate really is a pleasure to work with and I hope the writers decide to bring Jeanie back again because she's such a fun character."(Actor David Hewlett, in an interview with TV Zone magazine [#219])