The second film in the Marvel Cinematic Universe (MCU) is The Incredible Hulk which was released in 2008. The film introduced a new backstory for the hulk to differentiate it from the movie Hulk from 2003.
In the first MCU Hulk film, actor Edward Norton played the role of the green hulk and his alter ego Bruce Banner. He is joined by actress Liv Tyler who plays his love interest, Dr. Elizabeth ‘Betty” Ross. Betty’s father General Thunderbolt Ross (William Hurt) is hoping to recreate a World War II super soldier program and in the process exposes Bruce to gamma radiation that transforms him into the Hulk. He flees to find a cure for himself but is eventually tracked down by Thunderbolt, who forms an alliance with Emil Blonsky (Tim Roth). Emil undergoes the process of transforming into a creature similar to Hulk to be able to fight him. However, the transformation has a different effect on him. While Bruce continues to look for ways to cure himself, Emil begins to hunger for more power.
When Emil transforms into the creature known as the Abomination, Bruce has to decide between going back to his normal life or turn back into the green heroic monster once again to save the people. The end of the movie shows that Bruce has learned to control his transformation.
Tony Stark, also known as Iron Man (Robert Downey, Jr.), makes a cameo towards the end of the film talking about a group being formed. The Incredible Hulk has become part of The Avengers but the character is played by another actor now, Mark Ruffalo.
To date, Mark Ruffalo as Bruce Banner is seen in The Avengers (2012), The Avengers: Age of Ultron (2015), and the upcoming Thor: Ragnarok (2017). He is set to join the rest of the Avengers in the third installment, Avengers: Infinity War, scheduled to hit theaters in April 2018.