John O'Brien

Everyone seems to know who the father of Rachel's unborn baby is except for the man himself: Ross. When he finds out, he is more concerned with other matters than his relationship with Rachel. Meanwhile, Phoebe and Joey fib about a gas leak to gain entry to Monica and Chandler's apartment.

After taking a loan from Evelyn, Alan is guilted into double-dating with her, her new romantic interest and his daughter.

Cristina's encounter with a former nurse, now a patient at Seattle Grace, changes her forever; Derek and Meredith treat a construction worker who has miraculously survived an injury but is now faced with tough decisions about his future; and a patient recognizes Izzie from a lingerie ad, which makes her the subject of hospital gossip.

Alex gains the trust of Annie, a nervous patient with an extraordinarily large tumor, only to humiliate himself in front of her later. Meanwhile Derek chooses Meredith to assist with an elderly Parkinson's patient who may need surgery -- but Bailey disapproves of their relationship and is determined to make Meredith suffer -- and tensions escalate between Burke and Shepherd.

Some very deep secrets are made painfully public when Meredith's mother, who suffers from Alzheimer's disease, is brought to Seattle Grace for a surgical procedure. Meanwhile, some frightening news about Cristina's health is brought out into the open.

The truth is in short supply, as Meredith and Cristina lie to each other about the status of their relationships, George is given the unpleasant task of discharging an elderly patient who is no longer sick but refuses to leave the hospital; and Alex learns his fate after re-taking his medical exams.