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.

Directed by: Alberto Lattuada
Written by: Alberto Lattuada
Runtime: 105 minutes
Tagline: THIS WOMAN is the most thrilling act of espionage you've ever seen! She holds the key to "Matchless" - a spy plot as flawless as her beauty - as reckless as her body!
Cast:
Patrick O'Neal Patrick O'Neal
Perry 'Matchless' Liston 
Donald Pleasence Donald Pleasence
Gregori Andreanu 
Henry Silva Henry Silva
Hank Norris 
Howard St. John Howard St. John
General Shapiro 
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Also known as:
  • Mission Top Secret
  • Incomparable
  • O Incomparável Espião
  • Den usynlige agent
  • Sin rival
  • Lyömätön
  • Mission T.S.