A traumatic car accident fills the ER. Izzie pushes the boundaries of her probation. Cristina has a crisis of conscience about her deceptive teamwork with Burke.

Recent events strain Burke and Cristina’s relationship. Mark and Derek must work together when two close-knit brothers seek medical help. One of Meredith’s half sisters is admitted to the hospital.

Derek learns one of Addison’s secrets. Bailey talks about motherhood and depression to a mother who is set to have cancer surgery and who seems to not care about any…

Cristina gets to scrub in on a rare surgery which incites envy. Alex questions his future in plastics. George and Addison work together with Noelle. Noelle is pregnant with twins…

The men of Seattle Grace go on a camping trip together, Addison and Callie must team up to work on a patient, Meredith assists Sloan with a procedure unlike any…

George’s father has a serious heart problem that requires surgery and George chooses Burke to do the procedure. Burke doubts himself because he knows the pressure this kind of surgery…

Cristina meets Burke’s parents, the interns try to get Izzie’s job back, and Addison takes a day off, a surgical patient may be living her last day. Some of the…

The staff tries to prevent a patient from getting an elective surgery. Cristina tries to help Preston cope with the after effects of his surgery. A patient bails on their…

Shawn Sullivan, a car salesman who just had surgery, wants to get back to his routine so he doesn’t lose his renown. Addison works with a pregnant woman named Rebecca…

Meredith must make an important choice about which path she wants to follow to determine the future of her love life. While she considers her future she and others have…

George and Derek work together, Denny still doesn’t have a heart, and Meredith gets paired with Callie. A 12-week pregnant girl dies in the O.R. and her parents try to…

Denny needs a heart or else. Izzie and George go crazy trying to get him one. Derek has the life of a friend in his hands as he operates on…

This episode is the second part of a two-hour season finale. Richard tries to get information from Addison about a family member’s condition. Callie and George have a talk about…

The staff attends to an intern from another hospital who has short-term memory loss. This intern, named Marshall, also has caused a car accident that involved a married couple, their…

Meredith and George are experiencing morning-after tension at home and at work and it has the rest of the doctors wondering what’s up. Derek and Addison are experiencing their own…

The doctors are up to their necks in their usual levels of drama. Meredith is dealing with the backlash of sleeping with George, George and Burke are bonding in ways…

After a series of deaths at the hospital some of the staff become very superstitious. Izzie worries about Denny and gets confronted by Alex. A patient with OCD drives Cristina…

Meredith and Izzie take up knitting. Derek operates on Andrew, a spelling bee champ with a serious head injury. Bailey gets in on Andrew’s surgery because she’s worried that her…

Addison’s patient is a Catholic mother of seven. Addison gets in trouble after learning that the patient’s husband won’t use contraceptives. Derek treats a divorce attorney who asks if Derek…

An explosive case arrives at the O.R. that might endanger all the lives of the people working there, which leads Dr. Burke to declare a “Code Black” for the hospital….

Derek is still operating when he finds out about Meredith’s current situation. Meredith is freaking out about her situation. Webber and Bailey are dealing with medical health issues. Cristina and…

Derek and Addison’s relationship is rocked to the core when a former friend comes to Seattle Grace and his presence promises to shake things up for a few members of…

Cristina is bothered by a new year’s mandatory work limit. Izzie patient, Denny Duquette, wants two things: 1. a heart transplant, 2. Izzie. Addison detests Derek’s trailer, Derek visits Meredith’s…

Meredith and Cristina lie to each other and themselves about their relationships with McDreamy and Burke, respectively. George is given a hard task to expel a discharged and defiant woman…

All the nurses at Seattle Grace Hospital go on strike, leaving the doctors to fend for themselves. George refuses to cross the picket line and finally joins the nurses on…

The Colonial fleet faces starvation when the food-processing machines are contaminated. Kat plays a vital role in the success or failure of the “Passage” through space.

Tyrol discovers the Temple of Five on the algae planet. The temple may hold the Eye of Jupiter, which is believed to show the way to Earth. The Cylons take…

A figure from Adama’s past returns to haunt him. His return raises questions about why the Cylons launched their initial attack against the Twelve Colonies.

Adama stages a boxing tournament on the Galactica to help the crew relax. The competitive atmosphere sets off a brutal match between Kara and Lee. Flashbacks from New Caprica reveal…

Lingering feelings of rage lead Saul Tigh and Kara Thrace to cause problems aboard Galactica between the survivors from New Caprica and those who stayed with the fleet during the…

Apollo formulates a plan that threatens the very existence of the Cylon culture. Adama and Roslin must decide whether to follow through on the plan to use a biological weapon…

Adama plans to return to New Caprica and drop off a surprising person to act as a liaison between Galactica and the Resistance. Tigh’s insistence on the use of suicide…

Sharon helps the Resistance on New Caprica as Adama leads Galactica on a dangerous rescue operation. Tyrol races to save Cally from the execution squad. Meanwhile Anders uncovers treachery among…

Tigh must decide the fate of his wife Ellen after the assistance she rendered to the Cylons. Lee struggles with his assignment to protect the civilian fleet on its journey…

Tyrol participates in the Circle, a secret tribunal on Galactica that tries and convicts in absentia those accused of collaborating with the Cylons during the Occupation. The death sentences–administered without…

Tigh, Tyrol and Anders lead the Resistance on New Caprica to increasingly deadly attacks against the Cylons. Kara finds herself trapped in a new life with Leoben Conoy, and Duck…

After Boomer’s consciousness is downloaded into a new body following her death, she struggles with her new life on Cylon-occupied Caprica. Number Six is asked to help Boomer adjust to…

Chief Tyrol is plagued by terrifying dreams and seeks the aid of a priest. Kara leads a rescue mission to Caprica. Roslin and Baltar go head-to-head in a presidential debate…

When Baltar wins the vote, Roslin considers stealing the election because she believes he is a Cylon collaborator.

A crazed Cylon Raider attacks the Colonial fleet in a series of hit-and-run attacks. Overworked Viper pilots must defend a mining operation from this Raider that they nickname “Scar.”