B
- Blizzard - A costumed villain with a suit that enables him to produce ice and cold and a former Stark employee who was fired for robbery. Originally called Jack Frost.
- Blacklash - Is a costumed criminal who carries an energized whip. He became Whiplash later on.
- Blood Brothers - Each Blood Brother's tremendous strength and durability is dependent on his proximity to his twin. When standing together, the two have a high degree of superhuman strength, but if separated weaken to below even normal human levels. The Brothers also drain the blood of victims in the manner of a vampire, although it is unclear as to whether they totally rely on blood for sustenance. They have been previously commanded by Thanos and The Controller.
- Boomerang - A costumed villain who uses a series of gimmicked boomerangs as his signature weapons.
Read more about this topic: List Of Iron Man Enemies