Professor Polonium

Sam / Elvis / Charlie / Norman (voice)

Arnold / James (voice)

Malcolm Williams / Map-Screen 700

Station Officer Steele / Mike Flood / Tom Thomas / Trevor Evans (voice)

Doctor Crumpton (voice)

Rose Revani (voice)

Joe Sparkes (voice)

Penny / Sarah / Bronwyn / Mrs. Chen / Teleprinter / Map-Screen 700 (voice)

Ellie / Bella / Scoop Dooley (voice)

Dilys / Mandy / Helen (voice)

Moose Roberts (voice)

Gareth Griffiths (voice)