Big ups to Scrapper and KermitDFrog.

Previously on ER: Chen returns to the ER, and gets bitched out by Kerry for lying about a patient's medical condition; Bad-Heart Girl, a.k.a. "Valerie," thanks Lucy and says Lucy is a doctor as far as she's concerned; Corday brings a woman to see Rollins, then manipulates Rollins into telling her where he left the woman's sister's body by holding up a syringe full of enough morphine to kill him; Luka asks Carol how she's doing, and she confesses she's "exhausted"; Mark suggests that Holling move in with him in Chicago.

Mark "Get Set, Go" Greene looks groggily at his clock, which reads 5:50 in the morning, and jumps out of bed; the Weather Channel blares in the background. "Dad?" he calls out, coming into his living room to find David "Holling" Greene on the couch with a cup of coffee. "You're up early," Holling bellows over the TV, and says it might snow later. "Dad, it's a little loud," Mark says in an exasperated tone, and Holling suggests that Mark could put a door on his bedroom, which Mark says he doesn't want to do, and as the phone starts to ring, Holling offers to build him a door, and Mark asks him to turn "that thing" down and picks up the phone, and he apologizes to someone on the other end by saying, "My dad's visiting," while grabbing the remote out of Holling's hand and muting the TV. "Who the hell's calling at this hour?" Holling wants to know. "My neighbor, you woke her too," Mark says flatly, scratching his ear and heading into the kitchen. "The walls in this building are paper-thin," Holling grouses, adding, "By the way, we're out of coffee," just as Mark picks up the empty pot and clanks it back down, and he goes on to say that he could barely get a cup out of the "dibble-dabble" left himself. I love Holling -- specifically, I love Holling's accent, and the way he busts on Mark doesn't hurt either -- but Mark looks like he might kill his father. He says he'll just get dressed and go to work. "This early?" Holling asks. "This early," Mark mutters. Holling says he likes "that Weather Channel," which he never bothered watching in San Diego because it always said "clear and sunny, clear and sunny, chance of a cloud, mostly sunny." He fixes himself a bowl of cereal. Mark rolls his eyes and goes to get dressed. Heh.

Carol "One For My Babies, And One More For The Road" Hathaway bustles into the ER, looking apprehensive. Chuny welcomes her back and asks after the twins, and Carol says that "they're doing great," but she doesn't know how she'll do: "This is my first full day without them." Get out the binoculars, everyone, and you'll see this subplot heading east from Marin County right .