'Invasion' by Martin Worth

While exploring the caves beneath a mansion, two boys go missing. Ridge is sent in to investigate, but when he visits the local village he is arrested by an army unit, which has taken over the entire area and evacuated all of the villagers. He soon discovers that during the Second World War, the mansion was used as a base for the development of bacterial warfare, and that the chemical weapons which were stored there have now somehow leaked into the local water supply…


John Paul (Doctor Spencer Quist), Simon Oates (Doctor John Ridge), John Nolan (Geoff Hardcastle), Simon Cain (Soldier), Barrie Cookson (Wilson), Leslie Meadows (Reggie), David Lincoln (Dave), Victor Platt (Joe Bates), Arthur Brough (Sandy Larch), Anthony Sagar (Sergeant Harris), Peter Welch (Tom Hedley), Sheila Raynor (Mrs. Smith)Joyce Windsor (Mrs. Hunter), Kim Butcher (Child), Geoffrey Palmer (Major Sims), Bill Stratton (Sergeant), Michael Elwyn (Duncan), the BBC thanks the 7 Filed Squadron, Royal Engineers for their co-operation

Directed by Jonathan Alwyn
Produced by Terence Dudley

TX:
21st December, 1970 @9.50pm - 10.40pm

Notes:
*Featuring Doctor Spencer Quist, Doctor John Ridge and Geoff Hardcastle

*This episode exists as a black and white film telerecording, and colour NTSC videotape