Father MacGabbhan
Barnet Rosset
Director
Producer
John Umley
Bishop Ryan
Daddy Walsh (6 episodes)
Roger Laver (6 episodes)
Gus Vanderlip (1 episode)
Gabriel Robinson
Self - Guest (1 episode)
Theodore Roosevelt (4 episodes)
John Wilson
Moody Burkhart
Dermot
Cameron Brogden
Derek
Lieutenant Colonel Owens
Matt Davidson
Thomas Gregson (154 episodes)
Director (1 episode)
Sandy
Henry Brown
Kevin Sweeney (13 episodes)
Martin B.
Charlie Wright
William Rainsferd
Richard Baker
Professor George Oswald (1 episode)
Ulysses S. Grant
Steven Abbate
Prof. Porter
Nicholas Holden
Gerry Moore
Charlie Hamilton
Jacob Reiser
Matt Furey (6 episodes)
Ben Nicholson (1 episode)
Burton Lowe (2 episodes)
Frank Brennan
Henry Dawes
Kerry Max Cook
Daniel Webster (4 episodes)
John Berry
Henry
David Roby (2 episodes)
John Miller (5 episodes)
Frank Nitzche
Detective Scofield
Douglas Thomas
Commodore Alfred Lind
Joe F. Brown
Clint Windsor
Harry Vardon
Tom Guthrie
Tom Guthrie (1 episode)
William Franklin
Gen. Benedict Arnold
Nick Barron
Joe O'Malley
Jeremy Bell (segment "The Passenger List") (1 episode)
Tom Bledsoe
Miles Hendon
Paul McCartney
Kieran O'Day
Executive Producer
Paul Cooper
Gary Hallet
Henry Morton Stanley
Annibal Ramirez / Carlos
Seth Warner
Harry Roland
Prof. David Ash
Alfred Ludlow
Cap. Robert Walton
(voice) (2 episodes)
Detective John Hallstrom
Benjamin 'Benny' Pearl
Bob Finkbine
Tom Casey
Martin Quarrier
James McEwan / Jonathan McEwan
Jules Kaye
Frankie McGuinness
Samuel De Valera Paxton
Crusoe
Richard "Stick" Montgomery
Chris Keller
Felipe Mendoza
Michael Pierson
Johnny Rourke