Ben 10: Protector Of Earth Codes -

Galactic Enforcer color set:
Press , , , , , , at the level selection screen. A sound will confirm correct code entry. Go into any level and you will be in the "Galactic Enforcer" color set. Both Ben and all his alien forms will be black and white and official "Galactic Enforcers".

Gwen 10 skin:
Press , , , , , , at the level selection screen. A sound will confirm correct code entry.

Gold color:
Press , , , , , , at the level selection screen. A sound will confirm correct code entry. Go into any level and you will be in a gold suit.

Upchuck:
Press , , , , , , , , at the level selection screen. A sound will confirm correct code entry. Upchuck will now be permanently unlocked; just select his silhouette on the Omnitrix.
Agent Spectre