Inferno quickly went to the top of the charts, winning every single boxing match he entered. Punches didn't really seem to affect him in any way. Nobody knew how he could take it, until one round when his opponent managed to pull off Inferno's shirt. Everybody gasped as they saw a large metal door open, and flames came out. Inferno ran away, never to box in a ring again. From then on, he relied on robbing banks.

Strength
Strength

Strength Source
Metal body.