Mark Sheppard

as The Ringmaster

as Senior Investigator Gary

as Astropath / Ultramarines Orbital Command (voice)(1 ep)

as Hagan(5 eps)

as Willoughby Kipling(12 eps)

as Fake Dr. Zito(1 ep)

as Self

as Ackley

as Young Captain Nemo

as Dr. Charles LeBlanc

as Curtis Hagen(6 eps)

as Benedict Valda(6 eps)

as Tanaka(3 eps)

as Jim Sterling(7 eps)

as Manservant Neville(2 eps)

as Russell(1 ep)

as Malcolm

as Anthony Anthros(2 eps)

as Ring Director(2 eps)

as Tom Prescott(1 ep)

as Rupert Stone(1 ep)

as Crowley(102 eps)

as Canton Delaware(2 eps)

as Charles Walker(3 eps)

as Leitch

as Romo Lampkin(7 eps)

as Peter

as Mitchell Parks

as Young Mr. Pain (uncredited)(1 ep)

as George Beckwahr(1 ep)

as Chomsky

as Hartman(1 ep)

as Johnny Patani(1 ep)

as Badger(2 eps)

as Ronan Dennehy(1 ep)

as Chris Downey(1 ep)

as Yuri

as Ivan Erwich(6 eps)

as Ian Fields

as The Chameleon(1 ep)

as Rod Darling(1 ep)

as Dimitri Sadesky(1 ep)

as Yuri Gregorov(1 ep)

as M. J.

as Fang

as Christopher 'C.J.' Yates

as Arnon(1 ep)

as Clay Sullivan(1 ep)

as Nero(2 eps)

as California

as CJ Yates(20 eps)

as Eddie Wicks(1 ep)

as Nigel Bowles

as Jack(1 ep)

as Leucon(1 ep)

as Paddy Armstrong

as Bob the Caretaker / Cecil L'Ively(1 ep)

as Eric(1 ep)