Denise Van Outen

Professor Polonium

Steven Kynman

Sam / Elvis / Charlie / Norman (voice)

John Hasler

Arnold / James (voice)

Colin McFarlane

Malcolm Williams / Map-Screen 700

David Carling

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

Kerry Shale

Doctor Crumpton (voice)

Sasha Behar

Rose Revani (voice)

Alex Lowe

Joe Sparkes (voice)

Tegwen Tucker

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

Harriet Kershaw

Ellie / Bella / Scoop Dooley (voice)