Captain Scarlet and the Mysterons - Season 1 Episode 26 -

Captain Scarlet and Captain Blue are tasked with covertly escorting Doctor Congrad, a leading astrophysicist, to Switzerland for a conference with the World President.To avoid suspicion, they travel on a typical commercial airline flight. Spectrum has discreetly booked every seat on the plane, leaving it nearly devoid of passengers. However, after the plane lifts off they are surprised to discover that it is also devoid of crew...and the plane is flying itself straight into a French alp!