After nearly two decades of episodes Grey's Anatomy has featured a lot of relationships, but the Mark and Lexie episodes of the run are fan favorites. Obviously, Meredith and Derek are the go-to couple that the audience associates with the show. But an underrated relationship that never got to live up to its full potential was the one between Lexie Grey and Mark Sloan, two characters that can be defined as each other's true love and soulmates.
