"Quid Pro Quo" is the tenth episode of Constantine. It aired on January 23, 2015.


Thousands of people across Brooklyn have slipped into a mysterious coma, including Chas' daughter. John must find and defeat the evil behind it before it consumes the city.[src]


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Behind the scenes

  • The Latin "quid pro quo" is often rendered into English as "tit for tat" or "something for something", although the former has a greater sense of retribution, whereas the Latin merely declares the exchange.
  • This episode features the first mention King Arthur and Merlin in the Arrowverse, prior to them appearing in person on DC's Legends of Tomorrow.

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