The Invisibility Helmet is a cloaking device that was used by Snaptrap in the episode Dog Dish, to commit a series of "diabolical" crimes. While being worn, the helmet can cloak its wearer with up to six different dial-adjustable settings: Visible, Fairly Invisible, Partly Invisible, Most Invisible, Completely Invisible and an unknown setting.
An image of Snaptrap's helmet is first seen on his Snap-Blog. Later, he attempts to stage a jailbreak by handing out invisibility helmets to the inmates at the Petropolis Prison. He implies that he bought all the helmets from an unspecified source. By the end of the episode, Dudley is in possession of a helmet.