TV highlights: Leonard goes in for surgery on 'The Big Bang Theory'

Information about Amelia's past and addictions emerge and cause problems at the hospital on "Grey's Anatomy" (ABC at 8 p.m.). Also, Arizona is forced to make a tough call in Dr. Herman's absence. When Leonard has to go under for a deviated septum surgery, Sheldon panics and begins to think that his roommate might not make it out alive on "The Big Bang Theory" (CBS at 8).