 | Marzena Godecki | ... | Neri (78 episodes, 1994-1997) |

| David Hoflin | ... | Jason Bates (78 episodes, 1994-1997) |
 | Jeffrey Walker | ... | Brett Bates (78 episodes, 1994-1997) |

| Alex Pinder | ... | Dr. Winston Seth (78 episodes, 1994-1997) |
 | Nina Landis | ... | H.E.L.E.N. / ... (77 episodes, 1994-1997) |
 | Liz Burch | ... | Dr. Dianne Bates (52 episodes, 1996-1997) |

| Brooke Anderson | ... | Cassandra 'Cass' Clayborn / ... (51 episodes, 1996-1997) |

| Nicholas Bell | ... | Dr. Hellegren / ... (41 episodes, 1994-1997) |

| Tony Briggs | ... | Dave Hartley / ... (36 episodes, 1996-1997) |
 | Lauren Hewett | ... | Mera (30 episodes, 1995-1997) |
 | Miki Oikawa | ... | First Officer (27 episodes, 1994-1996) |

| Kerry Armstrong | ... | Dr. Dianne Bates (26 episodes, 1994-1995) |
 | Sudi de Winter | ... | Benny / ... (26 episodes, 1996-1997) |
 | George Henare | ... | Malakat (26 episodes, 1997) |
 | Tharini Mudaliar | ... | Shersheba (26 episodes, 1997) |
 | Joel De Carteret | ... | Jake 'Froggy' Reilly / ... (26 episodes, 1994-1995) |
 | Bruce Hughes | ... | Commander Wellington (26 episodes, 1996-1997) |
 | Nadja Kostich | ... | Kellar (26 episodes, 1996-1997) |
 | Jacalyn Prince | ... | Vanessa Lane (25 episodes, 1994-1995) |

| Joelene Crnogorac | ... | Lena Hellegren (25 episodes, 1996-1997) |
 | Cassandra Magrath | ... | Zoe Kondelos (25 episodes, 1994-1995) |
 | Olivia Hiddlestone | ... | Sallyanne Taylor (25 episodes, 1996-1997) |
 | Verity McIntyre | ... | Morgan Clayborn (25 episodes, 1996-1997) |
 | Jeremy Angerson | ... | Kal (24 episodes, 1996-1997) |

| Damien Bodie | ... | Louis Danton (23 episodes, 1997) |

| Mark Neal | ... | Agent Jake Shelby / ... (23 episodes, 1997) |
 | Brenda Monaghan | ... | Agent Elly Hauser / ... (22 episodes, 1997) |
 | Paul Sonkkila | ... | Richter (21 episodes, 1997) |

| Martin Copping | ... | ORCA Cadet / ... (18 episodes, 1996-1997) |
 | Gregory Ross | ... | Paul Bates (16 episodes, 1997) |
 | Guy Mallaby | ... | Damien Geoffries (13 episodes, 1994) |
 | Andrea McEwan | ... | Lee Lucas (13 episodes, 1994) |

| Anthony Hayes | ... | Michael 'Mick' Byrne / ... (13 episodes, 1995) |

| Kristy Barnes-Cullen | ... | Joanne Rhodes / ... (13 episodes, 1995) |
 | William McInnes | ... | Commander Jack Lucas / ... (13 episodes, 1994) |
 | Samuel Johnson | ... | Robert 'Rocky' Rhodes / ... (13 episodes, 1995) |
 | Claudia Buttazzoni | ... | Kimberly McGinnis / ... (13 episodes, 1995) |
 | Melvin J. Carroll | ... | Second Officer (13 episodes, 1994) |

| Terry Serio | ... | Captain Sam Phillips / ... (13 episodes, 1995) |
 | Pamela Rabe | ... | Commander Byrne (13 episodes, 1995) |
 | Caitlin McDougall | ... | Lieutenant Borg (13 episodes, 1995) |

| Christopher Kirby | ... | Second Officer (13 episodes, 1995) |
 | Bryony Price | ... | Jodie (12 episodes, 1994) |
 | Mitch Deans | ... | UBRI Diver / ... (11 episodes, 1995-1997) |
 | William Gluth | ... | Parker Forsyth / ... (11 episodes, 1995) |
 | Michael Veitch | ... | First Officer Danton / ... (10 episodes, 1997) |

| Rhona Rees | ... | Ilona (10 episodes, 1997) |
 | Barry Friedlander | ... | Garren / ... (10 episodes, 1997) |
 | Cecille Johnson | ... | ORCA Cadet / ... (10 episodes, 1996-1997) |
 | Marie-Louise Walker | ... | Shalamorn / ... (9 episodes, 1997) |
 | Sonya Suares | ... | Liselle (9 episodes, 1995) |
 | Ed McShortall | ... | UBRI Diver / ... (9 episodes, 1996) |
 | Darius Mendoza | ... | ORCA Cadet (9 episodes, 1996-1997) |
 | Susan Gorence | ... | Mrs. Clayborn (7 episodes, 1996-1997) |
 | Peter West | ... | UBRI Diver / ... (7 episodes, 1996) |
 | Jean-Pierre Mignon | ... | Dr. Malcovitch / ... (6 episodes, 1996-1997) |
 | Nelao Hishongwa | ... | ORCA Cadet (6 episodes, 1996-1997) |

| Doug Penty | ... | UBRI Aid / ... (5 episodes, 1996-1997) |
 | Elliot Hayes | ... | Billy (5 episodes, 1994) |
 | Anthony Hawkins | ... | Searcher #1 / ... (5 episodes, 1995-1997) |
 | Heath Bergersen | ... | Jakamarra (5 episodes, 1997) |
 | Harriette O'Kellow | ... | ORCA Bridge Officer / ... (4 episodes, 1996-1997) |
 | Catherine Wilkin | ... | Madame President (3 episodes, 1997) |
 | Ian Wilmoth | ... | UBRI Guard / ... (3 episodes, 1996-1997) |
 | Desire Vincent | ... | Tribunal Member (3 episodes, 1996) |
 | Kirk Alexander | ... | Searcher (3 episodes, 1997) |

| Shanyn Asmar | ... | Searcher (3 episodes, 1997) |
 | Yvonne Virsik | ... | Kellar's Assistant / ... (3 episodes, 1996-1997) |
 | Prudence Mazorodze | ... | ORCA Cadet (3 episodes, 1997) |
 | Nicki Paull | ... | Searcher #2 (3 episodes, 1995) |
 | John Morris | ... | Commando / ... (3 episodes, 1996) |
 | Michael Wehbe | ... | Ship crew (3 episodes, 1994) |
 | Jackie Kelleher | ... | Female Elder (2 episodes, 1997) |
 | Tenley Gillmore | ... | Dolores / ... (2 episodes, 1994-1997) |
 | Belinda Davey | ... | Dr. Laviche (2 episodes, 1997) |
 | David Watson | ... | Male Crew Member / ... (2 episodes, 1994-1996) |
 | Fred Whitlock | ... | Johansson (2 episodes, 1994) |
 | Carol Stahl | ... | Tribunal Member (2 episodes, 1996) |

| Kee Chan | ... | Mr. Lee (2 episodes, 1997) |
 | Ashley Firman | ... | Senior UBRI Guard (2 episodes, 1994) |
 | Ric Anderson | ... | Commando / ... (2 episodes, 1997) |
 | Michelle Rupena | ... | ORCA Newsreader (2 episodes, 1997) |
 | Bob Newman | ... | Dr. Gabriel (2 episodes, 1995) |
 | Gordon Hunter | ... | Corroboree Group / ... (2 episodes, 1994-1995) |
 | Pamila Rabe | ... | Commander Byrne (2 episodes, 1995) |