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Cynthia Hooper is an ESU desk clark who was in a relationship with Mark Greene. She is portrayed by Mariska Hargitay.
Cynthia was hired to the ER as a new desk clerk, and she soon developed a relationship with Mark Greene. Their relationship was entirely physical, and when Mark had to visit his parents again later in the season, Cynthia tags along, only to realize that Greene does not love her anymore. After the awkward breakup, Cynthia leaves, but Greene stays to better take care of his ailing mother and begin to mend his relationship with his father.