"The Juggernaut possessed vast superhuman strength, the limits of which were never revealed. The Juggernaut's strength was sufficient for him to battle powerhouses such as Thor and the Incredible Hulk, placing his strength well into the Class 100 level, being able to lift in excess of 100 tons.
Aside from his incredible strength, the Juggernaut's body possessed an extraordinary degree of invulnerability to injury, allowing him to trade blows with some of the strongest heroes of the Marvel Universe. The Juggernaut could increase his invulnerability to even higher levels by generating a mystical forcefield around his body. This field was sufficient to enable him to withstand powerful energy blasts from beings as powerful as the Silver Surfer, multiple blows from Thor's hammer, Wolverine's adamantium claws, falls from tremendous heights, exposure to temperatures hotter than the surface of Earth's sun, etc. without sustaining injury. Some beings, such"