Turok: Evolution Passwords and Secrets (GameCube)

The game follows Tal' Set, a Native American who is transported to the Lost Land while fighting Captain Tobias Bruckner of the United States Army; apparently this occurs in the late 19th century, around the time of the Indian Wars. He is rescued by the seer Tarkeen that says he is the legendary Son of Stone, known to them as Turok. The story then introduces a new villain, the Sleg, who are a lot like the dinosoids and Purr-Linn from the previous games. The Sleg themselves largely seem to have no greater objective than enslaving humans; eventually, however, their leader, the genocidal Lord Tyrannus, reveals his plan to destroy the human city of Galyana with an army led by a colossal beast called the Juggernaut. the Juggernaut resembles a Diplodocus, but is much larger.

He also allows Bruckner to join the Sleg army. When Tal' Set saves the River Village's "Wise Father" from a Sleg base, he re-encounters Bruckner and a team of Sleg. Both him and the "Wise Father" are quickly recused by Djunn. Later, Tal' Set destroys the Suspended City that bridges the gap across a ravine that Lord Tyrannus' forces are attempting to cross to reach Galyana. Following this, he engages and disables the Juggernaut. (Wikipedia)

Passwords

Password Cheats
Input the following passwords at the "Enter Cheat" screen:

FMNFB - All Cheats Displayed + Big Head

texas - All Weapons

RAPTOR - Allows you to play as a raptor in multiplayer mode

HEID - Big Heads

emerpus - Invincibility

sllewgh - Invisibility

sellout - Unlock All Chapters

ZOO - Zoo Level

Unlimited Ammo
At the Enter Cheat screen, enter ''madman'' as the cheat.

Madman - Unlimited Ammo

Secrets

Demo Mode and Target Game
At the Enter Cheat screen, enter ''hunter'' as the cheat. You will be brought to Demo Mode. After Demo Mode is finished(either by natural progress or by manually skipping it), You can play a Target Game on the Title Screen; D-Pad aims and R fires.

Here's the final boss fight in the game and its ending: