The Hulk is one of the most powerful characters in the MCU , but there are multiple versions of the character in Marvel Comics that haven't yet been seen onscreen. Some even possess more power than others, with The Immortal Hulk arguably ranking among the most powerful beings in the entire Marvel Universe . Since his original debut in 1962's The Incredible Hulk #1, these are the variants proving to be the strongest version of Hulk in history .

15 Gray Hulk

Incredible Hulk #1 by Stan Lee, Jack Kirby, Paul Reinman, Artie Simek

Created by writer Stan Lee and artist Jack Kirby during their historic creative run early in the Marvel Universe, the first Hulk possessed superhuman strength but wasn't very fast or agile. He also lost all of the brainpower of Bruce Banner when he tr

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