The government sends Stanley on a mission where he must impersonate a safecracker who is identical to him. Stanley must fool the man's girlfriend plus somehow convince the gang he knows how to break into vaults.
Stanley's receives his next assignment and it's to let the enemy get their hands on fake plans concerning a missile system. But do to a mix up Stanley delivers the actual ones, then must figure out a way to fix his error.
The formula for the power pill is stolen. However, since the pill only works on Stanley, the thieves will also need to kidnap Stanley to brainwash him and then sell him to the highest bidder.
Stanley is sent undercover as "Slippery Sloan" to help bank robber Blackjack Clayton escape so he will trust Stanley enough to tell him where the $2 million in stolen money is hidden.