On April 5, a WILD and powerful episode of Grey's Anatomy awaits.

Seriously, a lion breaks loose in Seattle, leaving lives and relationships at risk, with the surgeons scrambling to contain the carnage. That's not something you see every day ... but it somehow works for Grey's.

Meanwhile, Lexie overhears Mark talk about moving in with Julia, Teddy tries to come to terms with Henry's death, Callie grills Arizona on her past lovers, and Alex requests to be taken off Morgan's case.

Finally, Meredith tries to support BFF Cristina. There's a lot going on.

Check out ABC's promo for "The Lion Sleeps Tonight" below ...

Steve Marsi is the Managing Editor of TV Fanatic. Follow him on Google+ or email him here.