Pause the game, then hold L1 + L2 and press Select. If you entered the code correctly, a female voice will say "Impressive". A small text message will appear in the upper left corner of the screen the game is resumed that displays the status of this cheat. Note: The code must be re-enabled after loading or upon entering new areas.
Game Shark Codes
Master Code (Must Be On) 0E3C7DF2 1645EBB30C211D1F F8A4B18F
No Borg 3C12AD9F FBDCFEF63C12ADA3 F8FCFEFE
No Klingons 3C12AF7F FBDCFEF63C12AF83 F8FCFEFE
No Imperial Troops 3C12B1CF FBDCFEF63C12B1D3 F8FCFEFE