Furon Invasion
After you complete the last mission you can go to Harbour city or Vietmahl, you will have to find a small yellow marker and walk into it to start the invasion.

In Harbor City, the marker is hidden under one of the crates in the harbor behind big Willy's restaurant.

In Vietmahl, the marker is in the military encampment behind the ruins.

Invasion Box's
In farfield their is a furon invasion box it is in a corn field all you have to do is find the car dealer place and go right if you find the right corn field you will see a red barn and across from the red barn their is a brown house the box is in the corn field.in harbor city the box is under a crate behind big willys on a ship and it is the ship that is on the right. in vietmahl find the camping tents and then look around and you wil see a table on the side of the table is the invasion box

PS2 Cheats for Destroy All Humans! Big Willy Unleashed

Destroy All Humans! Big Willy Unleashed cheat codes

Destroy All Humans! Big Willy Unleashed cheats