Jo is introduced in the
ninth season as an intern who initially clashes with
Alex Karev (
Justin Chambers). However, during
Miranda Bailey's (
Chandra Wilson) wedding, they bond over their shared difficult childhoods. As the season progresses, their friendship deepens, and Alex develops feelings for Jo. In the episode "Love Turns You Upside Down", after Jo assaults a parent for attempting to abandon her baby, she reveals to Alex that she was left at a fire station when she was two weeks old. Jo explains that she was passed around foster families until she began living in her car at age 16. She shares that Ms. Schmidt, a high school teacher, was the only person who ever cared about her and helped her succeed academically. Ms. Schmidt was also the one who gave Jo the watch she wears when she started working at the hospital. Alex compliments the watch and sits beside her, sharing a quiet moment of understanding. In the penultimate episode of season nine, "Readiness is All", Jo gets into an altercation with her then-boyfriend Jason Myers (
Charles Michael Davis), revealing he physically abused her. She fought him off, and he hit his head on the fireplace. Alex convinces Jason not to press charges. In the finale, "
Perfect Storm", Alex confesses his feelings to Jo, and they share a kiss. By
Season 10, Jo is a resident and is in a relationship with Alex. In
Season 11, Jo becomes frustrated with
Meredith Grey (
Ellen Pompeo) growing closer to Alex after
Cristina Yang's (
Sandra Oh) departure, feeling sidelined. In
Season 12, Jo finds an invoice from the fertility clinic where Alex and his ex-wife
Izzie Stevens (
Katherine Heigl) stored fertilized embryos when she had cancer. This discovery leads Jo to question whether her relationship with Alex is real, but Alex reassures her that his relationship with Izzie is in the past. Alex proposes to Jo, but she rejects him, revealing her frustration that he often prioritizes Meredith over her. In the season finale, "
Family Affair", Jo drunkenly confesses to
Andrew DeLuca (
Giacomo Gianniotti) that she is already married and cannot marry Alex because she is estranged from her abusive husband, Paul Stadler (
Matthew Morrison), having fled him to start a new life in Seattle. Alex walks in on Jo and DeLuca in a compromising situation, misinterprets it, and brutally attacks DeLuca, believing him to be assaulting Jo. In the
Season 13 episode "You Haven't Done Nothin'", Jo reveals to Alex that she is still married, and explains that she never told him because she feared he would attack her husband and end up in jail. Later, it is revealed that Jo's real name is Brooke and that Paul Stadler is her abusive husband. In
Season 14, Jo and Alex reconcile, and she confronts her abusive past when Paul returns with a new fiancée, Jenny, who Jo suspects is also being abused. Paul is later involved in a hit-and-run accident and dies from
second-impact syndrome after an altercation in the hospital. Jo donates his organs and finally finds closure. Jo and Alex get married in the Season 14 finale, "
All of Me". In
Season 15, Jo becomes a general surgical fellow. In the episode "Silent All These Years", Jo tracks down her birth mother, Vicki Rudin (
Michelle Forbes), and discovers that she is the product of
rape. This revelation sends Jo into a deep depression, and by the season finale, she voluntarily checks into a psychiatric ward. In
Season 16, Jo emerges from treatment and legally marries Alex, after realizing they never signed the
marriage license. She also becomes an attending surgeon. However, Alex leaves Seattle and eventually reveals through a letter that he has reconnected with Izzie, who had his children via their frozen embryos. He leaves Jo his shares in Grey Sloan Memorial and tells her she deserves better, but that he wants to be a father to his twins with Izzie. Jo is devastated but vows to rise above it. In
Season 17, Jo begins a brief
friends with benefits relationship with
Jackson Avery (
Jesse Williams), which ends when he moves to
Boston to take over the Catherine Fox Foundation. Around the same time, Jo treats a
premature baby named Luna, who loses her mother during childbirth. Jo grows attached to Luna and decides to switch specialties from general surgery to
OB-GYN. Jo applies to adopt Luna but is initially turned down due to a failed background check. Determined to become Luna's mother, Jo gets her friend Atticus "Link" Lincoln (
Chris Carmack) to temporarily foster Luna, and she is eventually granted full custody. Jo moves into a new apartment with Luna to start their life together. ==Development==