Grey's Anatomy Season 4, Episode 15 Losing My Mind Drama IMDB 8.2 Country United States Duration 43 min Air Date 2008-05-15 Actors Ellen Pompeo (Meredith Grey) James Pickens Jr. (Richard Webber) Chandra Wilson (Miranda Bailey) Kevin McKidd (Owen Hunt) Camilla Luddington (Jo Wilson) Kim Raver (Teddy Altman) Chris Carmack (Atticus Lincoln) Jake Borelli (Levi Schmitt) Anthony Hill (Winston Ndugu) Caterina Scorsone (Amelia Shepherd) Overview Dr. Wyatt refuses to let Meredith give up on therapy. Alex learns something else about Rebecca. The Chief wants Erica to perform a daring surgery. Christina continues to act strangely.