Physical:
* Extreme Cold: The Hulk's strength is derived from his rage, and cold can dampen his anger, potentially weakening him.
* Extreme Heat: While he can withstand incredible heat, extreme temperatures, especially those exceeding his tolerance, could cause him to weaken.
* Heavy Objects: The sheer weight of something like a massive building or a mountain could potentially crush him.
* Powerful Energy Weapons: Weapons like the Vibranium shield or a concentrated energy blast could potentially harm the Hulk.
Mental:
* Manipulation: His rage is his greatest weakness, and manipulating his emotions can lead to confusion and vulnerability.
* Mental Barriers: Mental attacks, illusions, or even the power of pure willpower can potentially control the Hulk.
* Hypnosis: A powerful hypnotist could theoretically control his actions, even against his will.
Other:
* Teamwork: The combined efforts of other heroes, using strategy and coordination, could potentially subdue him.
* Specialized Weapons: Weapons specifically designed to counter the Hulk's strength, like vibranium or specialized gamma-dampening devices, could weaken him.
* Magic: Magic, especially mystical energy and spells designed to counter his strength or control his mind, could potentially incapacitate the Hulk.
Important to Note:
* The Hulk's power levels vary wildly depending on the story and writer. He's often depicted as nigh-invulnerable, and some stories have him even breaking free from cosmic entities.
* While these are some of the things that can stop the Hulk, it's not guaranteed. His strength, resilience, and rage are formidable, and he's often been depicted as overcoming seemingly insurmountable obstacles.
Ultimately, the Hulk is a complex character with unpredictable abilities, making it difficult to definitively say what can stop him. His power and limitations often depend on the specific story and the writer's interpretation.