Contagious

When virtually all of the residents of Piedmont, New Mexico are found dead after the return to Earth of a space satellite, the head of the US Air Force's Project Scoop declares an emergency. A group of eminent scientists led by Dr. Jeremy Stone scrambles to a secure laboratory and tries first to isolate the life form while determining why two people from Piedmont - an old alcoholic and a six-month-old baby - survived. The scientists methodically study the alien life form, unaware that it has already mutated and presents a far greater danger in the lab, which is equipped with a nuclear self-destruct device designed to prevent the escape of dangerous biological agents.

Wealthy American housewife Mary Morgan takes her bullied son George out of school for home education,including a trip to Southern Africa. Whilst in Mozambique George is bitten by a mosquito which crawls through a hole in his net and dies of malaria. After his funeral at home Mary feels a compulsion to return to Africa where she meets English woman Martha O'Connell,whose 24 year old son Ben, a teacher with voluntary service overseas,has also died of malaria. Ben gave his net to one of his pupils,believing adults cannot catch malaria. The two women are shocked to see the high death rate caused by the disease and,whilst Martha stays in Africa as a voluntary helper,Mary petitions the American government to change things. Martha turns up at Mary's house unannounced and,helped by Mary's ex-diplomat father,they address a senate committee on health spending,persuading them to do more to combat malaria. They meet with some success though a coda states that much more can be done.

High-school students start a vigilante group in their neighbourhood but, as their power increases, they become more abusive and dangerous.

Six years ago NASA discovered the possibility of alien life within our solar system. A probe was launched to collect samples, but crashed upon re-entry over Central America. Soon after, new life forms began to appear and half of Mexico was quarantined as an infected zone. Today, the American and Mexican military still struggle to contain "the creatures," while a journalist agrees to escort a shaken tourist through the infected zone in Mexico to the safety of the U.S. border.

A meeting in a London bus with jewel thief Lady Christina takes a turn for the worse for the Doctor when the bus takes a detour to a desert-like planet, where the deadly Swarm awaits.

At the insistence of Ruth Van Rydock, an old schoolfriend who is convinced that there is something wrong, Miss Marple agrees to visit 'Stonygates', the country house of Ruth's sister.