When an old colleague with a breast lump calls for Andy's help—from space, of all places—the former Army colonel is at full attention. At the speed of light, she mobilizes both her hospital and NASA troops to perform a biopsy and, eventually, the removal of a growth. Back on Earth, Lu tries to help a pregnant woman with breast cancer make the delivery of her child—and the removal of the tumor—the happiest day of her life.

Lu goes up against the government when one of her patients turns out to be a suspected terrorist. Meanwhile, Andy treats a deaf woman for rheumatoid arthritis, which has the potential to cripple the hands—silencing her ability to speak.

Andy and Milo treat a woman with an enlarged heart and conflict about what surgery to perform on her. Lu gets angry with Marc after he stays out until after midnight and insists that she babysit him until he is more responsible. Andy tells a sexually active elderly woman that she has HIV. Lu finds out about a terrible hospital error when trying to find a matching bone marrow for a young leukemia patient. Lana and Peter search the inner city for a woman whose aorta could burst at any time and face some frustrating difficulties.

As a heat wave hits Philadelphia, Andy & the staff will need to get used to its disaster plan to cope with heat wave. Claire a patient of Dr. Campbell is told she will develop Alzheimer's disease within 10 years, she also wants to have a baby.

Andy & tells her kids about Dr. Morton, her kids question why she can't make time for kids. Clare worries that her kids might have the gene PGD (the gene that leads to finding Alzheimer's early.)

A young girl with Down's Syndrome tells Lu she shot a girl to get in a gang. The mother later tells Lu that she had her 16 year old (with Downs Syndrome) confess to the crime to protect her sister who actually committed the crime.

Lu helps a terminally ill patient's family deal with the complicated issues surrounding assisted suicide. Meanwhile, when Andy helps a young couple figure out why they are unable to conceive a child, she stumbles upon a cause that changes their lives forever. As Andy and Milo's relationship becomes serious, he invites her to dinner with his parents. However, Milo's mother, Eve, is less than thrilled with Andy being the new woman in his life.

Lu treats a young girl for E. Coli who may have contracted E. Coli from eating undercooked food. Lu meets Ben Sanderson, a man who works for the company that owns Rittenhouse and wants to film the doctors as they work in order to get more donations for the RWHC. Meanwhile, Andy treats a woman who has been trying to have a baby and learns a shocking secret about her Southern past. Also, Lana gives Lu and Andy's patients advice, leading to amazing results.

Andy tells a famous rock star and a patient to rest and cancel some of her concerts because of fatigue. The rock star invites Lu's young patient who has a terminal disease to spend the day with her. Lu's patient's mother directs a terrible accusation at the rock star. Ben starts a concierge service to keep the clinic open after it faces financial difficulties.

Dr. Campbell is asked to write an endorsement for a new book about female heart health written by a friend and patient. After the author dies of a heart attack, her husband refuses to publically announce her cause of death because he fears it would hurt sales of the book even though her diet had nothing to do with her death (she had heart disease). Lu is shocked when three high school girls come into the ER with similar and shocking symptoms that point towards poisoning.

Lu treats a young patient with Bi-Polar disease which causes her to act hazardously violent. Her mother must decide whether to keep her or give her up to a mental institution. Meanwhile, Andy helps a woman have an invitro fertilization. She uses new technology to help the couple have a boy because of a genetic female-only disease in the family but later a web of lies and deceivements is revealed. Peter gets jealous when Kayla dates a man he volunteers for at a zoo.

With Christmas only a few days away, Lana goes on a frenzy decorating the clinic and organizing a Secret Santa gift exchange. However, when a plan to set up Peter and Kayla backfires, she has a lot of explaining to do. Meanwhile, Lu delivers a virgin surrogate mother's baby but when the parents find out something about the baby, they do the unthinkable. Also, Andy must find a young girl who may die if she doesn't get treated for a deadly disease she may have.