Today we meet a new crop of interns, but I guess they decided adding 16 new doctors to the cast was too much, so each of our residents just gets one. (And yet I still can't remember any of their names.) Cristina and her new minion are working with Richard on Henry, the new Mr. Teddy, who needs to have a kidney removed. During the consultation, Richard learns of the little marriage of convenience that occurred, and he's livid about it, even though it's pointed out to him that it's not technically against any law. When Henry's surgery gets complicated, they realize Teddy is listed as his emergency contact, and so she is the one who they have to ask about doing more procedures once they are inside. Since she has no idea what it is that Henry would want, she just goes with Richard's recommendation. When Henry wakes up, he realizes that she's angry to have been surprised like that, but he explains how the rest of his family is dead or busy or bailed on him and so she's the only friend he's got there -- wife or not -- and she seems to forgive him.

In other new-relationship news, Bailey is hooking up with her hot nurse, who does sexy, inappropriate things like leaving her dirty notes in patient charts. Bailey seems both appalled and totally turned on by it and decides she's going to just have fun with it for now. Mere and Derek are back to being lovey-dovey after last week's fighting, and Meredith is obsessed with the fact that she can't get pregnant to the point where she takes 10 pregnancy tests over the course of the day just to be sure that there really is no bun in her oven.

Mark and Arizona are working together on a case, so Arizona uses the day to grill Mark about what she can do to get Callie back, and Mark thinks she needs to figure out what her faults are so that she can apologize. Arizona keeps coming up with ideas but finally asks Mark to just tell her what her problem is, since he seems to have something specific in mind. He informs her that when things get tough, she bails, so I guess we really are just going with the story that her and Callie's breakup was all Arizona's fault, and Callie was just a little bit cranky and not at all an equal partner in the great implosion that was their relationship. Arizona finds Callie at the end of the day to tell her that she knows she bails but she promises not to do it this time because she loves her, which is the perfect time for Callie to drop a (totally telegraphed throughout the entire hour) bombshell: she is pregnant with Mark's baby. Arizona manages to keep herself from bolting right out of the elevator when she hears the news, so we'll see how this goes.

Unsurprisingly, most of the residents aren't exactly nice to their interns, even though they learn that the Chief is looking for a new Chief Resident and that they're now being judged all the time. It turns out that Richard had the interns write evaluations of their residents at the end of their day and the only doctor who actually gets a good review is Alex, who spent the day being super-gracious and teaching his own student, because she's smoking hot. More important than a good review, he gets the ultimate prize of her, in his T-shirt, wandering into Meredith's kitchen for water at the end of the night. It's nice to know that in this crazy, turbulent world of ours, some things will never change, and Alex's ability to get any woman into his bed is one of those things.

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