Carol Kenney enthusiastically begins her first day as an internal medicine intern but has a rocky start when she disregards orders to help a patient; Carol meets Dr. Frost, a senior attending physician who may be the ally Carol needs.

Carol treats an elderly patient whose tests are inconclusive and must find a way around hospital policy to take extra time to observe her; Daniel is embarrassed when his fellow interns find out that he doesn't know how to draw blood.

It's Marathon day in the city, which means it's busy day for the doctors. Carol gets her chance at proving to Dr. Jacobs she can be a good doctor while Dr. Kutcher and Dr. Gilani help Dr. Sommers get over his fear.

Carol has her first "night float", being the only physician on duty for the night. The position comes with enormous pressure, and having already been warned by Dr. Jacobs not to call her, she instead asks Dr. Frost to

A popular college football student comes to the hospital after an injury only to learn he has a chronic health issue.

Carol tries to help the other interns find a work-life balance by using her skills learned as a working mom.

As the hospital hosts therapy dogs to help care for their patients, Carol helps Lexie when the emotional burden of being a doctor becomes too "ruff, ".

Carol excitedly plans an early Christmas celebration for Jenny, but Jenny's preoccupied with her secret first date with Daniel. Also, the doctors investigate a case of food poisoning at an office holiday party.

Carol pretends to be an attending doctor in order to get her patient into the ICU, and Jenny and Daniel run into Dr. Frost when they finally go on their first date.

When the interns are given performance evaluations by Dr. Frost and Dr. Jacobs, everyone takes the critique well... except for Carol.

When Carol learns about Lexie's secret hobby, she also finds out an even bigger secret... that everyone knew except her. Also, Caleb goes to battle with an insurance company for his patient.

When Carol's patient finally makes the liver donation list, she is upset by the lack of emotion from his transplant surgeon, Dr. Lewis (Patrick Fabian). Also, Lexie, Daniel and Caleb try to decipher why Dr. Jacobs has a tattoo of a duck.

After Carol's patient's transplant surgery is deemed a success, the interns tease her mercilessly about her obvious crush on the surgeon, Dr. Lewis (Patrick Fabian).