Marjorie Susan Monaghan (born March 19, 1964 Orange County, California, USA) is an American actress best known for her portrayal of Tessa Halloran (aka 'Number One') in the television series Babylon 5.
Marjorie has also guest-starred in such popular television series as "Law & Order", "Murder, She Wrote", "Cheers", "Becker", "L.A. Law", and "JAG". Her most recent starring role in a series was as firefighter/paramedic Kathleen Ryan on Aaron Spelling's RESCUE 77. Marjorie has also appeared in a number of telefilms and the feature films "The Bonfire of the Vanities", and "Regarding Henry".
