Calliope Iphegenia Torres, M.D. is a fictional character from the medical drama television series "Grey's Anatomy", which airs on the ABC in the United States. The character was created by series' producer Shonda Rhimes, and is portrayed by Sara Ramirez. She was introduced in season 2, as a senior orthopedic resident, as a love-interest for intern George O'Malley (T. R. Knight). Eventually becoming an attending orthopedic surgeon, the character was originally contracted to appear on a recurring basis, but received star-billing in season 3.