2K Games have revealed the fourth add-on pack for the popular RPG shooter game Borderlands, titled Claptrap's New Robot Revolution it will be available on the Xbox 360, PlayStation 3 and PC in September.

Claptrap's New Robot Revolution invites single-player and co-op fans back to try to suppress a deadly Claptrap revolution using one of four infamous vault hunters. The foursome find themselves caught in the crosshairs of a deadly civil war between the Hyperion Corporation's well-armed armadas and the ever-amassing army of homicidal Claptraps led by one of the most eagerly awaited characters in the franchise's history - the cunning Ninja Assassin. As vault hunters, players must put aside their past differences with the Hyperion Corporation, namely the organization's repeated attempts to wipe them from existence. For a hefty payday, they will join forces to help beat down the mechanical uprising and thwart the dastardly kung-fu expert, the Claptrap known only as Ninja Assassin.

The add-on provides more than 20 new missions, new enemies including original boss battles, waves of homicidal Claptraps, well-armed Hyperion soldiers, and local creatures that have been Claptrap-ified - including crab-traps, rakk-traps and skag-trapps. Players will also get 10 more skill points and three more backpack slots.

"A year ago Borderlands was an untested brand that through hard work and a lot of passion, turned out to be one of the best-selling, claptastic and skagtacular games we have ever created," said Christoph Hartmann, president of 2K. "A year later, we are releasing our fourth DLC installment, Claptrap's New Robot Revolution, which illustrates our enthusiasm for creating highly entertaining content that enhances a franchise. In addition to serving as the perfect bookend to the original game, what gamer doesn't love a kung-fu-wielding Ninja Assassin Claptrap with nunchuck skills?"

Claptrap's New Robot Revolution will cost 800 Microsoft Point for the Xbox 360 and 6.29 on PlayStation 3 and PC.