The Mighty Avengers (2007) #23
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Characters
Caught in a gamma bomb explosion while trying to save the life of a teenager, Dr. Bruce Banner was transformed into the incredibly powerful creature called the Hulk. An all too often misunderstood hero, the angrier the Hulk gets, the stronger the Hulk gets.
Wounded, captured and forced to build a weapon by his enemies, billionaire industrialist Tony Stark instead created an advanced suit of armor to save his life and escape captivity. Now with a new outlook on life, Tony uses his money and intelligence to make the world a safer, better place as Iron Man.
Cassie Lang is the daughter of deceased Avenger Scott Lang and a member of the Young Avengers.
As the Norse God of thunder and lightning, Thor wields one of the greatest weapons ever made, the enchanted hammer Mjolnir. While others have described Thor as an over-muscled, oafish imbecile, he's quite smart and compassionate. He's self-assured, and he would never, ever stop fighting for a worthwhile cause.
With the end of the Vietnam War, John Walker thought his dreams of becoming a war hero had also ended, until he learned of the Power Broker, who could give anyone superhuman powers, which Walker used to first become Super-Patriot and later, U.S. Agent.
The metal monstrosity called Ultron created the synthetic humanoid known as the Vision from the remains of the original android Human Torch of the 1940s to serve as a vehicle of vengeance against the Avengers.
Chthon is a demon taht possesses incalculable magical power, controlling every aspect of the dimension in which he is trapped.