TimeSplitters: Future Perfect cheats and cheat codes for Gamecube

Unlock Zombie Monkey
Finish the first Behind The Undead challenge with gold, silver or bronze

Unlock Corporal Hart
Finish the story mode in normal or hard mode.

Unlock Dr. Peabody
Finish the Amateur League with gold

Unlock Human sounds
Finish the Cats Out Of The Bag challenge with gold, silver or bronze

Carrion Carcass
Get gold, silver or bronze on the Rare Or Well Done challenge
on Behead The Undead