The World Council takes action - as the aliens' plans are revealed. Stars Patrick Troughton, Angela Thorne and Timothy West.

Marge …. Angela Thorne
Doctor …. Arnold Diamond
Ray/Pilot …. Clive Panto
David/Paul …. Crawford Logan
A. P. Smith …. Donald Hewlett
Charles …. Henry Stamper
Tom Harris …. John Shrapnel
Sally's mother …. Katherine Parr
Alien Controller …. Manning Wilson
Vera …. Margot Boyd
Foreign Pilot/Barry …. Mark Rolston
Sally Harris …. Maureen O'Brien
Corporal/Vince …. Michael Jenner
Geoffrey Palmer …. Robert Dawes
Baby Sam/Gloria …. Moir Leslie
George …. Patrick Troughton
Alien …. Peter Acre
Silkin …. Peter Wickham
'642' …. Timothy West

First broadcast on BBC Radio 4 in 1984. Show less