Ajanaffy Njewadda and her husband, a former Gambian ambassador, are suing the MTA and the cable network, accusing them of placing the ad in a dangerous spot for pedestrians.

"Our contention is that the ad shouldn't have been there," the couple's lawyer, Rehan Nazrali, told DNAinfo New York. "The combined nature of the ad along with its placement poses a hazard to people on the steps."

The poster's closeup of "Dexter" star Michael C. Hall with cellophane covering his face was "shocking and menacing," the lawsuit says. Hall played a mild-mannered crime lab technician for the Miami Metro Police Department who moonlights as a serial killer and uses the plastic wrap on his victims.