Hulk

Robert Bruce Banner was the son of Dr. Brian Banner, an atomic scientist, and his wife Rebecca. Although Rebecca deeply loved Bruce, who returned her affection, Brian hated the child. Possibly an alcoholic, Brian Banner was driven by an insane jealousy of Bruce for being an object of Rebecca's love. Brian Banner finally murdered Rebecca and was placed in a mental hospital. Bruce, a highly withdrawn, intellectual youth, was raised by his aunt, Mrs. Drake, and internalized his great pain and rage over his childhood sufferings.

Eventually, as an adult and a genius in nuclear physics, Banner went to work at a United States Defense Department nuclear research facility at Desert Base, New Mexico. There Banner met General Thaddeus E. "Thunderbolt" Ross, the Air Force officer in command of the base, and his daughter Betty. Banner and Betty Ross eventually fell in love with each other. Banner designed and oversaw construction of the "gamma bomb" or "G-bomb," a nuclear weapon that had a high gamma radiation output.Turning himself in Hulk

Thor

Thor is one of several powerful ancient beings who dwell in a magical realm called Asgard. Through history, these beings have been revered and worshiped as gods. Ages ago, Odin, lord of the Asgardian gods, desired a child who would one day exceed him in power. Odin wooed Gaea, the earth goddess, and from their union Thor was born in a small cave in Norway on Earth. Odin took him to be raised in Asgard by his wife, Frigga

The young Thor grew up alongside his adopted brother Loki, the trickster, who was always jealous of his more favored sibling. Thor grew in power and popularity and on his eighth birthday, Odin had the hammer Mjolnir created for him, enchanting it with powerful magic. Odin decreed that Mjolnir would be presented to Thor when his son had been proven a worthy warrior. After spending the next eight years training and performing heroic deeds, Thor was given the hammer and declared the greatest warrior in Asgard.

The Hawkeye

Clint Barton, Hawkeye, also known as Goliath and Ronin, was created by Stan Lee; he first appeared as a villain and later joined the Avengers. Clint lost both of his parents in a car accident. After six years in an orphanage, Clint and his brother, Barney, ran away to join the Carson Carnival. Clint soon caught the eye of the Swordsman, who took the young boy on as his assistant. Along with the help of Trick Shot, the Swordsman trained Clint to become a master archer. Clint later found the Swordsman embezzling money from the carnival. Before he could turn his mentor over to the authorities, Clint was beaten and left for dead, allowing the Swordsman to skip town. Clint's relationship with his brother Barney and Trick Shot soon deteriorated as well. 

Clint adapted his archery skills to become a star carnival attraction, a master archer called "Hawkeye", otherwise known as “The World’s Greatest Marksman”. He spent some time as a member of Tiboldt's Circus, before joining the Coney Island Circus. He witnesses Iron Man in action and is inspired to become a costumed hero. However, after a misunderstanding on his first outing, Hawkeye is accused of theft and believed to be a criminal. On the run, the naive Hawkeye meets the Black Widow, a spy for the Soviet Union, with whom he falls in love. Blindly following the Black Widow, Hawkeye aids her attempts to steal technology developed by Tony Stark. In one of their battles with Iron Man, the Black Widow is seriously injured. Hawkeye rescues her and flees the battle to save her life. But before Hawkeye can take her to a hospital, the Black Widow disappears. Hawkeye decides to be a "straight-shooter" from then on.

In the cinema, Hawkeye was portrayed by Jeremy Renner in Thor(2011) and in The Avengers(2012).

The Black Widow

Natasha Romanoff was created by Stan Lee, she was a spy from S.H.I.L.D. Considered one of the largest of all times spies. She joined the Avengers.

In the cinema, she is portrayed bt Scarlett Johansson.

The Iron Man

Iron man was created by writer-editor Stan Lee. A playboy, industrialist and ingenious engineer, Tony Stark suffers a severe chest injury during a kidnapping in which his captors attempt to force him to build weapon of mass destruction. He instead creates a powered suit of armor to save his life and escape captivity. Later, he uses the power to protec the world as Iron Man. He also has been a member of the Avengers.

Iron Man has been adapted for a several animeted TV shows and films. In the films, Tony Stark is portrayed by Robert Downey Jr., in Iron Man(2008), Iron Man 2(2010) and in The Avengers(2012).

The Avengers

We are going to talk about the history of The Avengers. Since the comic books.