Who is the mystery person at the bar? We'll find out on the November 18, 2010 episode of Grey's Anatomy.

Dr. Erica Hahn (Brooke Smith) sizes up her sexy surgeon counterparts Derek Shepherd (Patrick Dempsey) and Mark Sloan (Eric Dane). Gotta love these three together!

Lexie and Mark try to keep Derek's focus up. Will the head of neuro (and hotness) be able to come through?

Mark and Derek in "What Is It About Men." That will be a fun episode!

Eric Dane as Dr. Mark Sloan in the February 16, 2012 episode of Grey's Anatomy. It's titled "Have You Seen Me Lately?"

Mark Sloan off duty in this shot from the October 6, 2011 episode of Grey's Anatomy.

Mark and Jackson in the February 16, 2012 episode of Grey's Anatomy. It's titled "Have You Seen Me Lately?"

Mark breaks down in a heartbreaking scene from the Season 8 finale of Grey's Anatomy.

Mark and Meredith cry in a scene from the Season 8 finale of Grey's Anatomy. With good reason.

The guys chat about some things. Should be a fun episode.

Lexie Grey might be onto something with this new look. But seriously folks - that's a lot of blood Nick lost. The doctors tried in vain to save him but it was a lost cause at the end.

Mark's about to go to work in the April 12, 2012 episode of Grey's Anatomy, "Support System."