• 
  John Marinelli

   Mr. Pristley (2 episodes)
• 
  Christopher Dingli

   Chief Officer Hume (2 episodes)
• 
  Anthony Da Silva

   Doctor (2 episodes)
• 
  Stephen Oliver

   Captain Bartlett (2 episodes)
• 
  Andre Agius

   Helmsman (2 episodes)
• 
  Alan Paris

   Brocklebank (2 episodes)
• 
  Edward Caruana Galizia

   U-73 Navigation Officer (2 episodes)
• 
  Christopher Heiser

   U-73 First Mate (2 episodes)

• 
  Henry Zammit Cordina

   Sir Morrisson (Nelly's Father) (2 episodes)
• 
  Marysia S. Peres

   Nelly (2 episodes)
• 
  Nicholas Jackman

   Watch Officer (2 episodes)
• 
  Jonathan Pyatt

   Lieutenant Harold Charnside (2 episodes)
• 
  Jeanette Cutajar

   Sophie (2 episodes)
• 
  Richard Kohler

   Himself - Host (2 episodes)
• 
  Martin Angerbauer

   Otto Hersing (2 episodes)

• 
  Michael Ihnow

   Gustav Siess (2 episodes)
• 
  Davide Tucci

   Duncan McTavish
• 
  Erica Muscat

   Becky
• 
  Polly March

  Elizabeth Annie Dowse
• 
  Antony da Silva

  Doctor