John Leguizamo joins the cast of ER as Dr Victor Clemente -- Pratt gets a wake-up call when the new attending poses as a patient to test the knowledge of doctors in the ER. Meanwhile, Kovac bonds with the former coma patient and contemplates bending the rules for her. A breast cancer patient convinces Abby to get her first mammogram. Pratt's father Charlie tries to convince his son that he has turned his life around. Kristen Johnson, Laura Innes, Parminder Nagra, Scott Grimes, and Shane West also star.
Episode number: 12x5 Production Number: 2T6055 Airdate: Thursday October 20th, 2005