Brittany Marsino - Mari Jo Mason

Marilyn "Mari Jo" Mason first appeared in February 1994, originally portrayed by actress Pamela Bach before being replaced by Diane Barton later that year, who remained in the role until 1996.

History
In 1994, Mari Jo Mason was the head of the Jabot Cosmetics art department. She contacted her former lover, Blade Bladeson (Michael Tylo). She read about his upcoming marriage to Ashley Abbott (Eileen Davidson), and she wanted to see him, but Blade refused. Mari Jo was still in love with Blade, but he could not forgive her for sleeping with his twin brother, Rick Bladeson (also Michael Tylo). She agreed to keep their past hidden until she began blackmailing Blade. She witnessed the "fatal" drowning of Rick, while Blade ignored his brother's cries for help.

Later, Rick shocked everyone by returning to Genoa City alive. He was determined to get revenge on his brother for leaving him to die. Rick and Mari Jo had a short-lived romance, and Ashley, not knowing that Blade was a twin, thought that Rick was Blade. She believed that Blade was having an affair with Mari Jo. Upon confrontation, Blade had no choice but to tell Ashley about his twin brother. Mari Jo soon struck up a romance with Jack Abbott (Peter Bergman), and the two were engaged to be married. Jack broke off their engagement when he was reunited with his former lover, Luan Volien (Elizabeth Sung). Mari Jo tried to break Jack and Luan up by following them to St. Thomas on a vacation, where Ashley and Blade were also staying in an attempt to fix their marriage. After several switches between the twins, things took a turn for the worse, and Blade was fatally struck by a car in 1995.

Mari Jo decided to romance Jack's son with Luan, Keemo Volien Abbott (Philip Moon). He ended their relationship after Mari Jo hired a hooker to impersonate her in bed. After Luan's death, Mari Jo supported Jack after his loss, and she became obsessed with him. Then, Mari Jo shot Victor Newman (Eric Braeden) after she became fearful that Victor would find a fax that listed all of her misdeeds. After recovering, Victor decided to set Mari Jo up. He made it look like Christine Blair (Lauralee Bell) had a copy of the fax. Mari Jo drugged Christine, and she took her hostage. Along with Paul Williams (Doug Davidson), Victor found Mari Jo and Christine after they planted a tracking device on her. Mari Jo was about to kill Christine until she realized that the gun that Victor planted was full of blanks. Mari Jo was charged with the attempted murder of Victor and the kidnapping of Christine, and she was committed to a psychiatric facility in 1996.