Allie Gallerani Chloro in Elementary S1 E15 (2013)
Emily has just come home when a delivery man asks to come in and charge is phone. Emily is suspicious and doesn't let him in. After he leaves the doorway, she gets chloroformed by a masked intruder who was already in the house. (She should have let him in). Sherlock, Dr. Watson and Rhys (Emily's father) view the ransom video. Rhys is actually Sherlock's former drug dealer. Basically, the kidnapper wants money back that was stolen from them by Rhys. Then they all go to Emily's apartment, Sherlock Holmes discovers a few clues (and a brief flashback to the chloroform scene takes place) leading them to proceed to a nightclub to investigate.