At the "Extras" menu, select the "Unlock Content" option. Enter one of the following codes to unlock the corresponding bonus. Then, select the "Customize" option at the "Options" menu to activate the unlocked bonus.
Enter "V81fvUW3" as a code to unlock the Saucer attachments.
Enter "X91mw7zp" as a code to unlock the Saucer skins.
Enter "1gb57M2x" as a code to unlock the Biker costume.
Enter "51c24KiW" as a code to unlock the Chef costume.
Enter "J5d99bPz" as a code to unlock the Gangster costume.
Enter "Ly11r98H" as a code to unlock the Kung Fu costume.
Enter "7qd33J1n" as a code to unlock the Mime costume.
Enter "F9sT5v88" as a code to unlock the Velvet costume.
Enter "S63bf2kd" as a code to unlock the Seventies costume.
Enter "M13Ni95L" as a code to unlock the Sixties costume.
Successfully complete the game to get approximately 3,000,000 DNA and have ammunition recharge for your non-selected weapons.
Go to the Space Dust in Las Paradiso. Look closely at the movie posters to find an ad for the original Destroy All Humans!
When you do the first story mission in Belleville, France, Pox will start talking about video game ideas. Crypto will say, "You're a plumber, but you don't use plumbing stuff to kill your enemies, you just jump on them" (a reference to the Mario series), "You're a really fast hedgehog" (a reference to the Sonic series), and "You're a space marine on a planet with a ring around it" (a reference to the Halo series). Pox will say all those ideas suck and then makes up his own idea.