Desmond 'Grinder' Sinclair (24 episodes, 2000-2001)
Alex Mann (24 episodes, 2000-2001)
Rikkie Syngh-Baines (24 episodes, 2000-2001)
Fidget Wilson (24 episodes, 2000-2001)
Nick Masters (18 episodes, 2000-2001)
Doctor X (14 episodes, 2000-2001)
Simon Grey (14 episodes, 2000-2001)
Tempest / Templeton Storm (12 episodes, 2000-2001)
Asazi (12 episodes, 2000-2001)
Dr. X (9 episodes, 2000-2001)
Brandon Caine (8 episodes, 2000-2001)
(7 episodes, 2001)
Gangrene / Prof. Dr. Wolfgang 'Gangrene' Greenholtz (6 episodes, 2001)
(5 episodes, 2001)
Jimmy Woo (4 episodes, 2001)
Agent Diana Zurvis / Diana (4 episodes, 2000)
Children's voices (1 episode, 2001)
Craig (unknown episodes)