Sam unleashes.

When a trauma patient arrives at Grey Sloan, it forces Jo to confront her past. Meanwhile, Bailey and Ben have to talk to Tuck about dating.

Jonah and Amy’s first Valentine’s Day together gets derailed when Dina brings her birds to work, which also causes trouble for Garrett. Cheyenne gives Marcus a tattoo. Glenn makes videos for his daughter to watch while he’s at work.

As Season 3 comes to a close, Mandy Moore, Sterling K. Brown, Chrissy Metz and more take a stroll down memory lane.