 Marzena Godecki as Neri (series 1) |
 David Hoflin as Jason Bates (1) |
 Jeffrey Walker as Brett Bates (1) |
 Marzena Godecki as Neri (series 4) |
 David Hoflin as Jason Bates (4) |
 Jeffrey Walker as Brett Bates (4) |
 Kerry Armstrong as Dr. Dianne Bates |
 Alex Pinder as Dr. Winston Seth |
 William McInnes as Commander Jack Lucas |
 Cassandra Magrath as Zoe Kondelos |
 Joel De Carteret as Jake 'Froggy' Reily |
 Jacalyn Prince as Vanessa Lane |
 Andrea McEwan as Lee Lucas |
 Bryony Price as Jodie |
 Guy Mallaby as Damien Harris |
 Miki Oikawa as First Officer |
 Melvin J. Carrol as Second Officer |
 Nicholas Bell as Dr. Hellegren |
 Lauren Hewett as Mera |
 Kristy Barnes Cullen as Joanne Rhodes |
 Sam Johnson as Robert 'Rocky' Rhodes |
 Claudia Buttazzoni as Kimberly McGuinnes |
 Pamela Rabe as Commander Byrne |
 Anthony Hayes as Michael 'Mick' Byrne |
 Terry Serio as Captain Sam Philips |
 William Gluth as Dr. Parker Forsyth |
 Sonya Suares as Liselle |
 Caitlin McDougall as Lieutenant Borg |
 Liz Burch as Dr. Dianne Bates (#2) |
 Jeremy Angerson as Kal |
 Brooke 'Mikey' Anderson as Cassandra Clayborn |
 Joelene Crnogorac as Lena Hellegren |
 Sudi De Winter as Benny Malcovitch |
 Olivia Hiddlestone as Sallyanne Taylor |
 Verity McIntyre as Morgan Clayborn |
 Tony Briggs as Dave Hartley |
 Bruce Hughes as Commander Wellington |
 Nadja Kostich as Kellar |
 Susan Gorence as Mrs. Clayborn |
 Jean Pierre Mignon as Dr. Malcovitch |
 Petra Yared as Patti |
 Kee Chan as Mr. Lee |
 George Henare as Malakat |
 Tharini Mudaliar as Shersheba |
 Gregory Ross as Paul Bates |
 Mark Neal as Jake Shelby |
 Brenda Monaghan as Elly Hauser |
 Paul Sonkkila as Theodore J. Richter |
 Damien Bodie as Louis Danton |
 Michael Veitch as Officer Danton |
 Marie-Louise Walker as Shalamorn |
 Barry Friedlander as Garron |
 Heath Bergerson as Jakamarra |
 Molly McCaffrey as Emma Redfield |
 Rhonda Rees as Ilona |
 Kim Carter as Ilona's Mother |
 Catherine Wilkin as Madame President |