Cheats and Hints

Cheat Code Central
Includes secret missions, how to view credits, and game shark codes.
http://www.cheatcc.com/psx/codes/sti.html

Cheat Planet
How to get to credits and secret missions.
http://cheatplanet.com/pscheats/star_trek_invasion.htm

Game Revolution
How to turn on cheat mode and play credits movies for the Sony Playstation version.
http://www.gamerevolution.com/oldsite/games/codes/sony/star_trek_invasion.htm

Game Skanker
Includes walkthroughs, guides, and mission secrets.
http://www.gameskanker.com/gsps1/psxstartrekinvasion.htm

Game Winners
Includes how to activate cheat mode and view credits.
http://www.gamewinners.com/playstation/StarTrekInvasion.htm

Playstation Pro 2
Includes secret level options and cheat codes.
http://www.angelfire.com/games2/PlaystationPro/startrek.html

PS Cheats
Includes secret level information.
http://www.pscheats.com/scripts/cheat.asp?cheatID=255&letter=S&p=1&name=Star+Trek%3A+Invasion

World of Playstation
How to activate cheat codes, view credits, and play secret missions.
http://www.world-of-playstation.com/codes/playstation/star_trek_invasion.shtml