The Hulk possesses the potential for limitless physical strength depending directly on his emotional state, particularly his anger.[67] This has been reflected in the repeated comment, "The madder Hulk gets, the stronger Hulk gets." The cosmically-powerful entity known as the Beyonder once analyzed the Hulk's physiology, and claimed that the Hulk's potential strength had "no finite element inside."[68] Hulk's strength has been depicted as sometimes limited by Banner's subconscious influence; when Jean Grey psionically "shut Banner off", Hulk became strong enough to overpower and destroy the physical form of the villain Onslaught.[69] Writer Greg Pak described the Worldbreaker Hulk shown during World War Hulk as having a level of physical power where "Hulk was stronger than any mortal—and most immortals—who ever walked the Earth."[70] His strength allows him to leap into lower Earth orbit or across continents,[71][72] and he has displayed superhuman speed.