Marc Clifford

Marc Clifford (Marc Powers) is the main antagonist of the season 10 episode A Place at the Table in Criminal Minds. He portrayed by Grant Harvey.

Biography
Marc was born as Marc Powers, after Frank Kingman and Cora Gilliam had an affair. When Frank had just left his honeymoon with his wife Donna, and Cora was struggling financially. Not wanting the case to surface, he promised Cora that he would provide her with the money in exchange for his silence that Cora agreed to, although his meetings take place less frequently. And unbeknownst to Frank, Cora gave to Marc, who was his son. And to keep her silence Cora told Marc that her father was Frank Powers a US Army soldier and was lost in The Gulf War, and Marc believed her.

Ten months earlier, Marc soon started dating Jenny Kingman who is the daughter of Frank and Donna, and unaware that Jenny was his half sister. However, his relationship with her was unfaithful since he cheated on the several times with other women, later his other stepbrother Lance found out and convinced him to stop. And realizing that Marc was his son, he ended his affair with Cora and cut the payments given to the Gilliams, Marc soon deduced that Frank was his father, because he supported his family, so he soon devised a plan to revenge against the Kingmans and his mother.

A Place at the Table
Marc was invited to dinner with the entire Kingman family, and when confrontation began, Frank punished Lance for his relationship with Ezra, Frank then closed his eyes to Marc with disgust, Marc then fell into a psychotic break and recovered his gun and waited for Frank to be alone and shook him and made him unconscious, he then with a gun tied all the enclusive guests Jenna, he then killed the three Jenna, Lance and Clara, he tried to shoot Donna but his anger only took him spoiling her. He then set up the whole crime scene as a family reunion, he then kidnapped Frank and killed him, and among the others in the reunion only Ezra and Dillion survived, since Dillion was out of town, and Ezra passed out upstairs while the deaths happened.

BAU later begins investigating the case after a neighbor realizes that the door has been left open, he soon finds Ezra who is initially considered a suspect until BAU realizes that he did not do so because of his relationship with Lance. Soon after they call Marc for interrogation, Marc talks about his relationship with Jenna and then he fakes his innocence and gives a fake alibe saying he was working. And then Cora was questioned as a suspect, Marc later appears and confronts Cora saying she lied about her father, and Cora tries to explain that she did it to try to protect him, Marc then shows Frank's dead corpse to Cora, he later explains that he committed the murders, and when he is about to kill her, BAU appears and he surrenders without resistance.

Trivia

 * Marc is joining others psychotics of Criminal Minds to consider himself Complete Monster/Pure Evil, along with Floyd Feylinn Ferell, Robert Bremmer, Miranda Jakar, Patrick Sorenson, Donnie Malick, Jerry Tidwell, Jacob DuFour, Bryan Hughes, Caleb Dale Sheppard and Bryce Jarvis, among all the psychotics on this list only Marc and Caleb not a serial killer.