The Blacklist, «The Avenging Angel,» the Task Force races to locate a blacklister who uses any means necessary to return what has been unjustly stolen. Ressler asks Park for a favor, while Cooper tries to piece together unexplained gaps in his memory. In ET's exclusive sneak peek, a desperate Ressler (Diego Klattenhoff) corners Park (Laura Sohn), asking her for help so he can pass the drug test he'll need to be reinstated to the Task Force — only what he's asking her to do is a