Grey's Anatomy Season 10, Episode 21 ("Change of Heart"), which airs on April 24, 2014, brings Derek's sis Amelia (Caterina Scorsone) back to town. Shepherd family drama? Yes please. That's always fun.

However, that's not what the promo is about. Instead, it's all about Cristina Yang (Sandra Oh), who we'll be saying goodbye to over the last few episodes of the season. What will she do now that she hasn't won the Harper Avery? We can't wait to see her overcome this setback and go on to even bigger and better things!

Want more info? Here's the official synopsis of the episode: "Jackson [Jesse Williams] is given the daunting task of delivering disappointing news to the doctors. Meanwhile, Derek's [Patrick Dempsey] sister Amelia [Caterina Scorsone] drops by for a surprise visit, Richard [James Pickens Jr.] surprises Catherine [Debbie Allen] in Boston, and when Bailey [Chandra Wilson] gets frustrated by the slow pace of her research, she makes a risky decision."

Check it out for yourself here!

Catch this episode of Grey's Anatomy on April 24, 2014 at 9 p.m. ET/PT on ABC.

Rebecca Martin is an Associate Editor at Wetpaint Entertainment and our resident Game of Thrones, Breaking Bad, and genre TV expert. Follow her on Twitter and Google+!