Marjorie Monaghan

Marjorie Monaghan is a California-born American actress. Raised in Cincinnati, Ohio, she is best known for her portrayal in 1997 and 1998 of Theresa Halloran (aka 'Number One', leader of the Mars Resistance) in the television series Babylon 5.

Monaghan has performed in other science fiction roles, such as "JoJo Thorson" in the 1993 series Space Rangers, where reviewers remarked on her portrayal of JoJo as a "low-voiced feminist blond bombshell", and the "Heroes and Demons" episode of Star Trek: Voyager. She was considered for the role of T'Pol in Star Trek: Enterprise.

Monaghan starred as Kathleen Ryan in the 1999 series Rescue 77, where a reviewer said her "tough, thoughtul performance" was the only saving grace of a "generic action series".

• H.E.L.P. (unknown episodes, 1990) .... Jean Ballantry
• Quantum Leap (1 episode, "One Strobe Over the Line - June 15, 1965", 1990) .... Edie Landsdale
• Law & Order (1 episode, "Prisoner of Love", 1990) .... Cathy
• The Bonfire of the Vanities (1990) .... Evelyn Moore
• Aftermath: A Test of Love (1991) (TV) .... Erica
• Regarding Henry (1991) .... Julie
• Murder, She Wrote (1 episode, "Thicker Than Water", 1991) .... Elaine Franklin
• Nemesis (1993) .... Jared
• L.A. Law (1 episode, "Eli's Gumming", 1993) .... Amanda Hagen
• Space Rangers (6 episodes, 1993–1994) .... JoJo
• Jack Reed: A Search for Justice (1994) (TV) .... Lorelei Bradley
• California Dreams (1 episode, "Tiffani's Gold", 1995) .... Coach Hardaway
• Star Trek: Voyager (1 episode, "Heroes and Demons", 1995) .... Freya
• Deadly Games (1 episode, "Dr. Kramer", 1996) .... Sharon
• The Pretender (1 episode, "Every Picture Tells a Story", 1996) .... Martha Poole
• The Sentinel (1 episode, "Poachers", 1997) .... Elaine Walters
• JAG (1 episode, "Against All Enemies", 1997) .... Alice Tuppany
• The Warlord: Battle for the Galaxy (1998) (TV) .... Jana
• Babylon 5 (7 episodes, 1997–1998).... Number One/Theresa Halloran
• Rescue 77 (2 episodes, "Pilot" and "Career Day", 1999) .... Kathleen Ryan
• Becker (1 episode, "Imm-Oral Fixations", 1999) .... Amanda
• Andromeda (2 episodes, "The Dissonant Interval: Part 1" and "The Dissonant Interval: Part 2", 2004) .... Louisa Messereau
• The Great War of Magellan (2005) ....

• Romeo and Juliet as Lady Capulet
• The Cherry Orchard as Anya
• Crimes of the Heart as Lenny Magrath
• The Curate Shakespeare As You Like It as Rosalind
• Sister Mary Ingnatius... as Diane
• Gas, I as Gentleman in Black
• The Diviners as Norma Henshaw
• Aria da Capo as Corthurnus
• Talking With as Moira