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.

While the other interns battle over who gets the patient with a fascinating and rare problem, Carol's standard, run-of-the-mill case turns out to be something more than it seems; Daniel makes a crucial mistake that gets Dr. Jacobs attention.

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.

Carol's dear friend Phyllis (guest star Jane Kaczmarek) is admitted to the hospital, and Carol jealously witnesses what retirement would have looked like for her. Also, Daniel takes credit for Caleb's excellent diagnosis and is bothered when Caleb doesn't seem to mind.

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,".

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