My Common Enemy

J.D. decides he won't start dating again until Elliot does, but doesn't expect the person she starts dating to be his brother Dan, who's still sticking around after the recent death of their father. When J.D. catches them sleeping together in the on-call room, things get a little awkward between the three. Meanwhile, after Turk is diagnosed with Type II Diabetes, he milks every ounce of sympathy out of his friends. Elsewhere, Dr. Cox and Dr. Kelso get fed-up with Molly's perception that everyone is good at heart and seek to prove her wrong.