Gregory Paul Martin

as Professor Crabbe

as (voice)

as Professor Crabbe

as Luther

as Armistead Knox

as Gareth Carr (1 episode)

as Roger (1 episode)

as Colonel Ari Ben Zayn (1 episode)

as Marcus Rawlings (1 episode)

as Andrew (1 episode)

as Richard

as Ghostmaster (voice) (1 episode), as Ghostmaster / Motorists (voice) (1 episode)

as Marco Santorelli (3 episodes)

as Danny Briggs (1 episode)