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"She's smart. She's beautiful. She's perfect."

—Mark Sloan

Alexandra Caroline "Lexie" Grey was the daughter of Susan and Thatcher Grey. She became an intern at Seattle Grace and was Meredith Grey's half sister. She passed away in a plane crash in the Season 8 finale, with Mark by her side telling her he loves her and painting a picture of their life together, talking about how they would have children and get married.

Childhood and upbringing

Lexie was the daughter of Thatcher Grey and his second wife, Susan. She had a younger sister, Molly Grey-Thompson. She had also an older half-sister Meredith Grey, born to Thatcher and his ex-wife Ellis. As a child she was bright and she skipped third grade. She was very popular in high school, having a great group of friends, being crowned prom queen, and being class valedictorian.

Personal life

Lexie came to Seattle for her mother's funeral and after, she went to Joe's. There, she met her future brother-in law Derek Shepherd who she later discovered worked at Seattle Grace. Derek took a shine to her to the great annoyance of Meredith but more so, Cristina.

She was on Christina's team and Christina calls her '3' and later Lexipedia (due to her photographic memory)

As George was retaking his intern year and only Lexie knew, the two bonded and became best friends. Having parties with fellow interns such as Graciella Megan, Steve, Pierce, Claire and later Ryan. She also moved in with George but in Season 5 moved out when she was lonely and Mark insisted that Derek take her home.

She also developes a short friendship with Sadie Harris when she covers for Lexie, saying that she (Sadie) gave Mark Sloan a penile fracture, even though it was actually Lexie. She later guards the door so Lexie can visit Mark in his room.

In the middle of season 5, she organizes for the interns to pratice medicine on each other because the residents don't teach them.

Although certainly not sister-like, Lexie and Meredith slowly became friends with no resentments but both bonded with their own group. Meredith even makes Lexie her bridesmaid.

In Season 5, Lexie also developed a great hunger due to Mark and Derek not talking to each other because of her relationship with Mark (although this was a cover up for her real life pregnancy).

Romantic life

When Carolyn Shepherd came to Seattle, she asked Lexie how many sexual partners she had, Lexie said six or seven, kind of seven.

George O'Malley

Lexie makes her first appearance in Seattle Grace when she introduces herself to George.

Lexie learns that George O'Malley is repeating his intern year and helps him keep the other interns unaware of his failure. She and George develop an unlikely friendship over intern struggles and their strained relationships with Meredith and Callie, respectively. Lexie is shown to have been smitten with George. Mark Sloan notices this and vows to be less mean to George if she'll admit her feelings to him. As a result, Sloan is slightly more polite to the two of them and George misunderstands, thinking Lexie and Sloan are sleeping together. Lexie continues to vie for George's affections.

George finally passes his intern exam and seems to pay less attention to Lexie. The final straw occurs when he receives his new interns and Lexie discovers he hadn't the decency to even ask to have her assigned to him. She breaks down in front of him, calling herself stupid and him a jerk. Lexie had chosen to forgive George and makes a peace offering, keeping her feelings for him quiet.

Mark Sloan

While working with Mark Sloan, she developed an attraction, intensified by Derek's ban on them going out. One night, Lexie went to his hotel room, stripped and says "teach me", they began a secret relationship. They grew close very quickly and Mark developed true feelings for her but Lexie was tired of the secrecy and put their relationship on hold. Eventually Mark told Derek and they began dating in public. Their relationship hit a small bump when Mark decided he did not want to go to dinner with her and Thatcher because fathers didn't like him, but in the end he went. Another slightly larger bump happened when he suggested she move in with him into a condo he was considering buying but she didn't think she was ready because she was so young, then somehow the conversation turned intensly awkward when Mark accidently brought up marriage, when Lexie sayed in 5 years she'd still be a resident, and he said that there were plenty of residents that were even married.

When Derek performed a 'rogue surgery' on an inoperable patient and Lexie wanted to take part, Mark encouraged her with a huge smile and said "Go get your rogue on.", which hinted that they were in a commited relationship. When Mark's 18-year-old daughter, Sloan Riley arrives, she's supportive, even better than he was with dealling with it. But later on she proves to have some difficulty when his daughter reveals she is pregnant and Mark offers to let her stay as long as she wants in him and Lexie will be there for her, entirely not consulting Lexie on the matter. And her being a grandmother at 24 is way too much for her to take, after an argument about it later, he asks her not to make him choose between her and Sloan (his daughter) Lexie asks "Why, because you'll choose her?" and Mark responds "Yeah." And Lexie says, tearfully, "I think our relationship just ended." Then she goes to Meredith's house and gets drunk, and has a discussion with Alex, leading to her sleeping with him. She later discoveres that Mark slept with Addison, and he discovers she slept with Alex. He becomes angry at her for this.

Lexie began to date Alex after his divorce with Izzie. She becomes jealous when she finds out Mark slept with Reed. Later Mark tells her he still loves her, to which she replies "I have a boyfriend" Mark tells her "'I know. I'm just saying you could have a husband." When the shooting happened, Mark and Lexie tended to Alex's shot wound. During this, Lexie told Alex she loved him, much to Mark's dissapointment. Alex left Lexie after her breakdown, and Mark took Lexie to the phyc ward. At Joes, April tells Lexie that Mark loves her, that's why he always stares at her. Lexie then goes to his apartment, applys her makeup in the elevator, then is crushed to see him making out with Derek's sister, Amelia. Lexie and Mark continue to flirt. One day, he tells her he misses her. Then she asks him to talk to a nurse who hates her, to which he is willing to exchange for one drink. Upon seeing which nurse it is, he makes it two. She tells him "Fine" That night, and tells Jackson to come in during the date telling her he needs her for something as an excuse to leave the date. Lexie arrives at Joe's later, tells him that it isn't fair for either of them since Mark is at a different point in her life than Lexie. Mark responds by simply kissing her, she kisses him back. Jackson arrives to pull her out of her date, and Lexie tells him to go, and she continues to kiss Mark. What Lexie doesn't know, is that Mark had a one night stand with Callie during their breakup, and Callie is now pregnant with his child. When Mark tells Lexie, she looks at him with disbelief, yelling "I cannot believe you got me in this position, TWICE!" and then storms out of his apartment. Mark wants to make things right, but Lexie won't talk to him, so he arranges for Jackson to find out what's bothering Lexie, in exchange for scrubbing in on his surgery. Lexie, with tears in her eyes, spills the beans to Jackson about how Mark has left her behind once again and does not care about how she feels. Jackson decides not to tell Mark cause he feels like Lexie told him this in good faith.

Jackson Avery

Jackson and Lexie begin dating. Lexie tells Mark that she is seeing someone else when they're at Callie's baby shower. He asks if he knows him but Lexie walks away. When Mark sees Jackson walk out with Lexie he figures it out. During Callie's surgery after her accident, Lexie is sent to watch over Mark. Jackson tells her he's leaving, as she still has feelings for Mark, but Lexie decides to go home with Jackson.

In the Season Eight Finale, her as well as her sister and brother-in-law were on a plane going to another hosiptal for surgury when the back of the plane broke off. A piece of the plane layed on top of her crushing her pelvis and legs. Mark realizes that she is going to die, holds her hand and tell her that he loves her. She dies. Seconds later Merdieth and Cristina come and see her, all three of them mourn her death.

Career

Lexie is first mentioned in the episode in which her sister Molly is pregnant and taken to Seattle Grace. When Molly is talking to Meredith she mentions her sister and her education at Harvard University. She graduated from Harvard Medical School before being accepted in Seattle Grace's Intern Program.Lexie is a new intern at Seattle Grace Hospital. Her mother Susan suddenly died when Lexie was just about to start her internship at Mass General. She has been assigned to surgical resident Cristina Yang for her medical internship, and has already borne some striking similarities to her half sister, Meredith Grey. She aced her psych clerkship. One of the better interns, Lexie won the intern competition set up by Izzie.

Notes

She was allergic to eggs.
She hated apples, and thinks they shouldn't be allowed to be fruits, but she likes apple juice.
She owned a car.
She was a perfect artist using "Etch-a-sketch".
She liked math.
She played the trombone.
When was expressing a point, she often waves her hands.
When her mother died unexpectedly, she snuck into a graveyard to bury her mother's cat beside her.
She had a "Photographic Memory" which helped her through college, though the idea is not reached.
Nearing the end of Season 5, Lexie's excessive eating was part of a private joke between the cast due to Chyler's pregnancy. Most shots with Chyler had her stomach covered.
She was called Lexipedia