Related Clues:
- Fighters who turn turtle?
- Stealth fighters
- They're silent and deadly
- Martial artists primarily needed in shark film, not Western
- Extras in 'The Last Samurai'
- Spies of feudal Japan
- Stealthy assassins
- Men in black
- Deadly agents
- Martial arts mercenaries
- Ancient Japanese assassins
- Assassins who sometimes wielded katanas