The following are known GameShark Codes for Men in Black – The Series: Crashdown on Sony Playstation (PS1).
These codes were also known as Action Replay Codes and in most cases will work on both devices.

These codes are for the U.S. version of the game.

• Infinite Health
  800EFF5C 0064
• Infinite Ammo
  80044886 2400
• Have All Levels
  800955EC FFFF
  800955EE FFFF
• Have All Weapons
  801327EF 2401
• Infinite Health For Godfather On “Protect The Godfather” Stage
  801F5F2C 012D