Dudley Foster

as Heather (archive footage)

as Jonathan

as Grimthorpe

as Eberkopf / Strange passenger

as Mr. Mayhew

as Inspector Hook (6 episodes)

as Symes

as Chief Supt. Vyvyan (1 episode)

as Heather (1 episode)

as Tom Fenton

as Sir George West (1 episode)

as Grimshaw

as Darkly

as Federman

as Darkly (1 episode)

as Foster (6 episodes)

as Mr. Green

as Hector Kenley (1 episode)

as Leo

as Whitsun

as Caven

as Blueskin

as Inspector Clay (5 episodes)

as James Hughes (1 episode)

as Antrobus