A secret agent possesses a ring that makes him invisible for a short time, once every 10 hours. He is in pursuit of an evil criminal mastermind but, at the same time, must evade an enemy agent who also wants the ring.

Action, Comedy, Thriller, Science Fiction

Patrick O'Neal, Ira von Fürstenberg, Donald Pleasence, Henry Silva, Nicoletta Machiavelli, Howard St. John