This 1991 children's science fiction series represented the screen-writing breakthrough for BAFTA Award-winning Doctor Who writer Russell T Davies. The superb characters and imaginative storylines are already evident, as is Davies' obvious debt to Doctor Who. Many have seen lead character Marcie as a Doctor-type figure and Davies even admits to borrowing her yo-yo gravity test from a 1975 episode!

When the sinister Mr Eldritch donates computers to every student at their school, wise-beyond-her-years third-former Marcie, and her fifth-form friends Reet and Thom, decide to investigate. Who is this millionaire? How can they thwart his evil plans? And what is the link to the sinister archaeologist Miss Pendragon? Soon the three teenagers are uncovering a plot that doesn't just threaten the pupils of the school, but the whole human race...