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The son of crimeboss Silvio "Silvermane" Manfredi, Joe Manfredi himself was the costumed supervillain known as Blackwing, but after his defeat by the Thunderbolts as a member of the Masters of Evil VII, Joe Manfredi decided to retire as a costumed supervillain, and stay on as crimeboss. He founded his own super-army: Heavy Mettle 
Several members of Heavy Mettle were later incorporated in the Secret Initiative under Norman Osborn's reign.
Equipment: None known.
Transportation: None known.
Weapons: None known.
- No special notes.
- No trivia.
- 7 Heavy Mettle (Earth-616) Members
- 5 Appearances of Heavy Mettle (Earth-616)
- Media Heavy Mettle (Earth-616) was Mentioned in
- 1 Images that include Heavy Mettle (Earth-616)
- Team Gallery: Heavy Mettle (Earth-616)