1. Amelia tells Owen she doesn't want babies yet …
After a pregnancy test revealed she wasn't expecting, Amelia (Caterina Scorsone) tells Owen (Kevin McKidd) she wants to stop trying for kids. "Why the rush?" she asks. "We were barely engaged and now we're barely married and we're already trying for kids." After seeing that her new husband is clearly disappointed, she explains: "Let's just be us for a minute, enjoy us and feel what it's like to be two people in a marriage, newlyweds, before we add to it."
2. … and also struggles with her new identity
Amelia has way more than babies on the brain. "She really dove into this new identity, where she was no longer the black sheep but suddenly the chief of neuro and adored by a responsible guy like Owen," Scorsone tells TVLine. "Then the pregnancy test triggered the bridge between those compartmentalized pieces of her life and all the trauma that she experienced came flooding into Seattle in a way that she [hadn’t anticipated]." Adds the actress, who is currently pregnant off screen: "She's suddenly being hit with the reality that she can't really run away from the past."
3. Leah comes back
Despite her rocky history (read: she hooked up with Arizona and Karev and then got fired by Richard Webber) with the Grey Sloan Memorial staff, Leah (Tessa Ferrer) comes back to work at the hospital. Aside from her heated relationships with the other doctors, Stephanie Edwards (Jerrika Hinton) tells Jo (Camilla Luddington) about Leah's flaws as a surgeon. "She didn't fight hard enough to get in the OR, or study, or prepare," Stephanie says. "She drilled through her patient's leg, all the way down to the table. … Did I also mention she almost brought the hospital down with harassment lawsuits and complaints against attendings because she was sleeping with attendings?"
4. Catherine is determined to fire Karev
Catherine (Debbie Allen) confronts Bailey (Chandra Wilson) over Karev (Justin Chambers) still working in the hospital after he beat up DeLuca (Giacomo Gianniotti). "You made no move to fire Karev, there's no replacement search. What is the plan?" she asks. "If a doctor on our staff has been charged with a felony assault, he should not be a doctor on our staff." After telling Bailey that she's too lenient on her staff, Catherine warns, "If you don’t take some steps to replace Dr. Karev, I will."
5. Bailey defends her choice to keep Karev on staff
Bailey, who has been subtly helping and defending Karev throughout the season, explains to Catherine why she hasn't forced him to leave the hospital entirely. "He's innocent until proven guilty. We have a justice system," she says. "I don't want to throw away a good surgeon's career because of one mistake."
Watch the heated moments in the clips above.
Grey's Anatomy airs on ABC Thursdays at 9 p.m. ET.
Want stories like these delivered straight to your inbox? Sign up now for the Us Weekly newsletter!