Bane was originally a prisoner, called Antonio Diego, in the South American jail of Pena Duro, who apparently served a life sentence for murder. He was selected to be the test subject for military experiments involving the drug Venom, Venom and was Dr. Woodrue's first successful subject. Originally, Diego was comparatively scrawny and diminutive, but when Venom started to take effect, he turned into a hulking monster with superhuman strength, or the "ideal killing machine", in Dr. Woodrue's words.
Powers and Stats
Tier: At least 9-B
Name: Antonio Diego
Origin: Batman and Robin (1997 film)
Classification: Human enhanced with Venom
Powers and Abilities: Superhuman Physical Characteristics
Speed: Unknown (Appears slow on-screen. Blitzed by Batman)
Lifting Strength: At least Class 5 (Can rip out walls easily. Sent 6 guys flying effortlessly)
Striking Strength: At least Wall Class
Durability: At least Wall level (Survived a fall from over 7000 feet into the ocean. Tanked Batman's punches with little to no issue, and Batman was only able to knock him out with a metal pipe)
Range: Extended melee range (Much larger than average humans)
Standard Equipment: None notable
Intelligence: Below Average, barely capable of speech
Weaknesses: When he is disconnected to Venom, he reverts immediately back to his normal, scrawny self.