A psychotic gun for hire and borg supremacist who caught the wrong end of a rocket and was rebuilt by Arasaka into the ultimate weapon of war.
He is a cyberpsycho, who's only condition for working for Arasaka in Firestorm was that every one of his missions has collateral damage.
In Firestorm, Adam Smasher was recruited by Arasaka to fight in the fourth corporate war. Adam was more than happy to fight for Arasaka because he knew Morgan Blackhand had been hired by Militech (in previous encounters where Adam had challenged Morgan he had been ignored).
In Firestorm Shockwave, Adam gravely injured Shaitan and killed Johnny Silverhand, now wearing the Arasaka "DaiOni" Powered Armour Conversion. Adam was left to an ambiguous fate as he was last seen fighting a fierce battle against Morgan Blackhand in the crumbling Night City Arasaka tower.