'The Quatermass conclusion': Professor Quatermass, Joe Kapp and his wife, Clare attempt to marshal assistance from American and Russian quarters. 'The enduring mystery of Stonehenge': For 5,000 years, the sacred site of Stonehenge has stood on the plain of Salisbury, England, bearing silent witness to a myriad of mysteries.

In 1944 the Nazi military and scientific departments are researching the occult. Russian mystic Grigori Rasputin builds a dimensional portal off the coast of Scotland, where he intends to use it to bring about the destruction of Earth. In his employ is the ultra-silent assassin Karl Ruprecht Kroenen, who seemingly can't be killed. However, the United States has sent forces of their own to Scotland, along with Professor Trevor Bruttenholm, who is well-versed...

The velvet vampire: A husband and wife accept the invitation of a mysterious woman to visit her in her secluded desert estate. Tensions arise when they realize that she is a vampire and that they are both objects of her desire. Lady Frankenstein: After her father, the Baron Frankenstein, is killed by one of his creations, Lady Tania creates a monster of her own to defeat it. Grotesque: Lisa and her family are attacked at their remote mountain cabin...

A scientist who makes himself invisible finds he can't reverse the process, and is driven into madness and murder; after a man is falsely imprisoned he takes a drug that will make him invisible and also drive him mad; an attractive model volunteers for an experiment with an invisibility machine; the grandson of the invisible man uses a secret formula to spy on Germany in World War II; a scientist helps a fugitive from the law become invisible; two...