A science-fiction film about children who manage to split the atom and thereby create a new form of popcorn.

Christopher Beeny
as Horatio Flynn

Ernest Scott
as Ernest Rutheford Chappell

Patrick Wells
as Hans 'Einstein' Blotz

Ian Smith
as Tom Chizzler

Anneke Wills
as Alice Nightingale

Wendy Westcott
as Mary Huxley

Peter Sallis
as Bill - grocery merchant