Denise Van Outen

as Professor Polonium

Steven Kynman

as Sam / Elvis / Charlie / Norman (voice)

John Hasler

as Arnold / James (voice)

Colin McFarlane

as Malcolm Williams / Map-Screen 700

David Carling

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

Kerry Shale

as Doctor Crumpton (voice)

Sasha Behar

as Rose Revani (voice)

Alex Lowe

as Joe Sparkes (voice)

Tegwen Tucker

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

Harriet Kershaw

as Ellie / Bella / Scoop Dooley (voice)

Su Douglas

as Dilys / Mandy / Helen (voice)

Nigel Whitmey

as Moose Roberts (voice)

Gary Andrews

as Gareth Griffiths (voice)