• 
  Rachel McAdams

  Kate McNab
• 
  Don McKellar

  Darren Nichols
• 
  Martha Burns

   Ellen Fanshaw (18 episodes, 2003-2006)
• 
  Susan Coyne

   Anna Conroy (18 episodes, 2003-2006)
• 
  Seán Cullen

  Basil
• 
  Oliver Dennis

   Jerry (18 episodes, 2003-2006)
• 
  Catherine Fitch

   Maria (17 episodes, 2003-2006)
• 
  Rothaford Gray

   Nahum (11 episodes, 2003-2006)

• 
  Paul Gross

  Geoffrey Tennant
• 
  Graham Harley

  Cyril
• 
  Mark McKinney

  Richard Smith-Jones
• 
  Stephen Ouimette

  Oliver Welles
• 
  Michael Polley

   Frank (17 episodes, 2003-2006)
• 
  Leon Pownall

  Brian
• 
  Matt Fitzgerald

  Sloan