An actor and Sheila's husband who flirts with Barbi. After abandoning Sheila, he attempts to assault Barbi but is fended off. He later reconciles with Sheila, and they have a child.
Sheila and Mark are married but experience separation before reconciling.
Mark maintains a flirtatious dynamic with Barbi, creating underlying tension in their social circle.
Rick perceives Mark as a romantic threat due to the cologne, triggering a flight response.
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