Washed-up agent John Craig is given the task of proving his worth by tracking down a Russian scientist on the run. Cross and double-cross is the name of the game.
| Actor | Role |
|---|---|
 Stanley BakerJohn Craig | John Craig |
 Geraldine ChaplinMiriam Loman | Miriam Loman |
 Donald PleasenceLoomis | Loomis |
 Dana AndrewsBlake | Blake |
 Warren MitchellOmar | Omar |
 Sue LloydJoanna Benson | Joanna Benson |
 Derren NesbittAndrew Joyce | Andrew Joyce |
 Cec LinderMankowitz | Mankowitz |
 Vladek SheybalAaron Kaplan | Aaron Kaplan |
 Ferdy MayneMarcus Kaplan | Marcus Kaplan |
 Clifton JonesHetherton | Hetherton |
 John CollinAsimov | Asimov |
 Aharon IpaléGabrilovitch | Gabrilovitch |
 Howard GoorneyZimmer | Zimmer |
 Michael PooleZhelkov | Zhelkov |
 J.G. DevlinWaiter | Waiter |
| FFrank MaherDaniel | Daniel |
| CCliff DigginsHarry Bigelow | Harry Bigelow |
 Yuri BorienkoGuard | Guard |
 Tom BowmanGuard | Guard |
| RRick LesterPrison Camp Guard (uncredited) | Prison Camp Guard (uncredited) |
| VVictor HarringtonClub Member (uncredited) | Club Member (uncredited) |
| PPhillip StewartClub Member (uncredited) | Club Member (uncredited) |
| DDinny PowellKGB Gunman (uncredited) | KGB Gunman (uncredited) |