Bruce Banner/ Hulk (Played by Eric Bana, Edward Norton, Mark Ruffalo):
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Banner first transforms into the Hulk shortly after he is accidentally exposed to the blast of a test detonation of a gamma bomb he invented. Subsequently, Banner will involuntarily transform into the Hulk whenever he gets too angry or if his life is in danger, leading to extreme complications in Banner's life.
Betty Ross (Played by Jennifer Connelly, Liv Tyler):
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Betty Ross first appeared in The Incredible Hulk #1 (May 1962), and was created by Stan Lee and Jack Kirby. The daughter of Thunderbolt Ross. Bruce Banner's most enduring love interest and later his wife. Deceased due to poisoning by the Abomination, later revealed to be cryogenically preserved and transformed by the Leader and M.O.D.O.K. into Red She-Hulk.
General Thaddeus "Thunderbolt" Ross (Played by Sam Elliott, William Hurt):
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Thaddeus E. "Thunderbolt" Ross is a fictional character who appears in comic books published by Marvel Comics , usually depicted as an archenemy of the Hulk. Ross is a United States military officer, the father of Betty Ross , ex-father in-law of Glenn Talbot, father in-law of Dr. Bruce Banner, and was head of the Gamma Bomb Project that turned Banner into the Hulk. After the creation of the Hulk, Ross pursues the creature with a growing obsession, and after learning that Banner and the Hulk are one and the same, Ross hunts Banner as well. In 2008, Ross first appeared as the Red Hulk, into which he had been transformed in order to better combat his nemesis.
Emil Blonsky/ Abomination (Played by Tim Roth):
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Abomination is a fictional character, a supervillain that appears in comic books published by Marvel Comics. The character first appears in Tales to Astonish #90 (April 1967), and was created by writer Stan Lee and artist Gil Kane.