In 1991, she guest-starred on Superboy with a young Clark Kent before he called himself Superman, playing the villainous Christina Riley, a woman who is, in secret, a werewolf.
In 1992, Marshall had a three-episode guest role on The Wonder Years and later guest-starred on shows such as Seinfeld, Nash Bridges, Grapevine and Diagnosis: Murder.
World, directed by William Maloneas, as Dr. Abby O'Reardon, an evil scientist who rejuvenates her boss (and later becomes his mother) and is bent on turning grown men into babies.
The same year, she landed a recurring role on Spin City and starred with Bette Midler and Dennis Farina in the film That Old Feeling, where her character fell in love with the paparazzo played by Danny Nucci.
Marshall has been cast in several pilots that were not picked up, including the Elizabeth Lackey series Cooking Lessons and Rob Thomas's Sticks.
It featured her as Dr. Claire Allen, a psychiatrist supervising a man named Trevor (Jeremy Piven) who thinks he is Cupid.
In 2000, Marshall returned to television screens: first with a three-episode guest appearance as a porn star and love interest for Jeremy (Joshua Malina) on Aaron Sorkin's Sports Night, and then in Cursed (a.k.a.
Marshall also had a secondary role in the Steve Martin-Bonnie Hunt remake of Cheaper by the Dozen and a cameo appearance in Break a Leg, which starred her husband Danny Nucci.