A deadly snake being transported to toxicologist Dr. Marion Stowe (Sarah Miles) gets out of its cage and goes about terrorizing London, especially a German crook (Klaus Kinski) and his accomplices (Oliver Reed and Susan George), who have kidnaped an American boy (Lance Holcomb). The
morally discriminating snake leaves all the good people alone (though sending plenty of chills up their spines) and only bites the villains. Wide-angle shots representing the snake's point of view are thrown in to drum up some scary effects. The film boasts one of the best casts to grace a British
film in a long time; without the snake, it could have been an intriguing thriller.