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100

Storyline in the Marvel Universe where heroes were divided into two sides after the Superhuman Registration Act was passed.   

What is Marvel's Civil War? 
100
Made their film debut in 2012 and consists of Captain America, Iron Man, Hulk, Thor, Black Widow, and Hawkeye.
Who are The Avengers?
100

A member of the X-Men who has an adamantium skeleton and sharp claws.

Who is Wolverine?
100
Appeared as the main villain in the 2002 Spiderman film. 
Who is the Green Goblin?
100
Hulk's first appearance comic.
What is The Incredible Hulk #1?
200
Hulk returns to Earth after being banished by Marvel's Illuminati to seek revenge against them. 
What is World War Hulk? 
200
Originally composed of seven members. Included superheroes like Superman, Flash, Wonderwoman, Aquaman, Green Lantern, Martian Manhunter, and Batman.`
Who is The Justice League of America?
200
The alternate persona of the owner of Wayne Enterprises.
Who is Batman?
200
Also known as the "Mad Titan" who consistently searches for the six Infinity Stones across the universe. 
Who is Thanos?
200

 Batman's first appearance comic.

What is Detective Comics #27?

300

In this story, after Bane breaks Batman's back, Batman chooses Azrael as heir to the cowl to set order in Gotham. 

What is Batman: Knightfall?

300
Originally appeared in The Brave and the Bold #4 consisting of Robin, Kid Flash, and Aqualad. The group later adopted its famous name in The Brave and the Bold #60.
Who are The Teen Titans?
300

A former mercenary who became a test subject of the Weapon X program after being diagnosed with cancer.

Who is Deadpool?

300

A cloned version of Superman created by Lex Luthor that serves as Superman's antithesis. 

Who is Bizarro?

300
Spiderman's first appearance comic.
What is Amazing Fantasy #15?
400
Flash goes back in time but accidentally sets off the New 52 timeline.
What is Flashpoint?
400

Originally includes Namor, Doctor Strange, Hulk, and The Silver Surfer. 

Who are The Defenders?
400
A Martian that was brought to Earth by Dr. Saul Erdel and a founding member of the Justice League of America.
Who is Martian Manhunter?
400

This villain is the pursuant of the Anti-Life Equation, and he is the wielder of the Omega Beam. 

Who is Darkseid?
400
Captain America's first appearance comic.
What is Captain America Comics #1?
500
Batman creates plans to neutralize members of The Justice League if they were ever to become evil. These plans are later stolen and used against the heroes to almost kill all existing members.
What is Justice League: Tower of Babel?
500
Group of student-mutants trained in Xavier's School for Gifted Youngsters who were the most exceptional at the institute. 
Who are the X-Men?
500

Originally debuted as a member of Watchmen, was a nuclear physicist and has the ability to control matter even at the subatomic level.

Who is Dr. Manhattan?

500
"The Devourer of Worlds," is a frequent antagonist to the Fantastic Four.
Who is Galactus?
500
The most expensive comic sold at 12 million dollars.
What is Action Comics #1?