Even more concept art from Next Avengers: Heroes of Tomorrow has been released, courtesy of Marvel.com. This time around, we're treated to concept art of the new members of the Avengers, as well as the character design for the Avenger's greatest foe - Ultron.

Check out the Behind-the-Scenes featurette below.

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Whenever the forces of evil threatened mankind, Earth's mightiest heroes, the Avengers, were there to stop them - until they made the ultimate sacrifice in their final fight with the indestructible robot, Ultron.

But all was not lost, for Tony Stark (Iron Man) kept the children of the Avengers safe and raised them to become the teenage heroes of tomorrow.

Now James (son of Captain America and Black Widow), Torunn (daughter of Thor), Azari (son of the Black Panther), and Pym (son of Wasp and Giant Man) must finish the fight their parents started. Soon the arrow-slinging son of Hawkeye will join their ranks, but it will take more than five teens to destroy the machine that defeated their parents.

If these young heroes have any hope of winning, they must find the missing Hulk and come together as... the Next Avengers!

Next Avengers: Heroes of Tomorrow hits DVD and Blu-Ray September 2, 2008.