• 
  William Devane

  Older Detective John Langdon (1 episode, 1997)
• 
  Ron Livingston

  Elliott Ness (1 episode, 1997)
• 
  Ted King

  Jack Logan
• 
  Don Stark

  Eugene Matuzek
• 
  Kurt Fuller

  Dr. Dale Easter
• 
  Brian Cousins

  Sam Usher (1 episode, 1998)
• 
  Kevin Fry

  Soldier #1 (1 episode, 1997)
• 
  Wayne Duvall

  1st Mate Lewis (1 episode, 1998)

• 
  Nick Jameson

  Heinrich (1 episode, 1997)
• 
  Patrick Kilpatrick

  Mr. Kiefer (1 episode, 1998)
• 
  Heidi Schanz

  Hanna Schmidt (1 episode, 1997)
• 
  Wolf Muser

  Scientist #1 (1 episode, 1997)
• 
  Billy O'Sullivan

  William Matuzek (1 episode, 1998)
• 
  Bob Larkin

  Mr. Steckler (1 episode, 1998)
• 
  Michael Kagan

  Svengali (1 episode, 1998)

• 
  Shanna Moakler

  Allison Kendall (1 episode, 1998)
• 
  Kelly Farrell

  Prostitute (1 episode, 1997)
• 
  Ric Sarabia

  Ferritt (1 episode, 1997)
• 
  Lisa Thornhill

  Rita Lake (1 episode, 1997)
• 
  Melora Hardin

  Edith Thomas
• 
  Rena Sofer

  Dr. Carrie Ann Trent (1 episode, 1998)
• 
  Eric Gerleman

  Scientist #2 (1 episode, 1997)
• 
  Keith Szarabajka

  Cromwell (1 episode, 1998)
• 
  Cristi Conaway

  Off. Claire Hemmings (6 episodes, 1997-1998)
• 
  Scott Klace

  Brink's Driver (1 episode, 1997)
• 
  Nicolas Coster

  Captain Harriman (1 episode, 1998)
• 
  Pancho Demmings

  Timecop (1 episode, 1998)
• 
  Patrick Fabian

  Dean Cooke  (1 episode, 1998)
• 
  Sebastian Tillinger

  Kreutzer (1 episode, 1997)
• 
  James Keane

  Sheriff (1 episode, 1998)
• 
  Frantz Turner

  Chauffeur (1 episode, 1997)
• 
  Christian Bocher

  Young Damon Orselli (1 episode, 1997)
• 
  Cliff De Young

  Detective Rick Nolte (1 episode, 1997)
• 
  Anna Galvin

  Anne Thompson (1 episode, 1997)
• 
  Larry Holden

  Fuqua (1 episode, 1998)
• 
  Julie St. Claire

  Freddie (1 episode, 1997)
• 
  Fred Henderson

  Police Officer (1 episode, 1997)
• 
  John Kapelos

  Al Capone (1 episode, 1997)
• 
  Belinda Waymouth

  Catharine Eddowes (1 episode, 1997)
• 
  Gregory Scott Cummins

  Karl Martin (1 episode, 1998)
• 
  William Morgan Sheppard

  Inspector Wells (1 episode, 1997)
• 
  Ralph P. Martin
• 
  Joel Weiss

  Desk Clerk (1 episode, 1997)
• 
  Kris Iyer

  Dome Technician (1 episode, 1998)
• 
  William G. Schilling

  William J. McNeil (1 episode, 1998)
• 
  Patrick Pankhurst
• 
  Lucky Luciano

  Boy #1 (1 episode, 1998)
• 
  Bruce Campbell

  Tommy Maddox