Storm Shadow served with Snake Eyes in Southeast Asia and both of them later studied the secret art of Ninjitsu with the family of Storm Shadow, a ninja clan that could trace its history back through thirty generations of ninjas. Unhinged by the murder of his uncle and mentor, he infiltrated Cobra seeking revenge, but found vengeance to be a poor substitute for life. Now, in semi-retirement at a remote mountain hideaway, he occasionally takes on a special mission or two - if Snake Eyes asks him nicely.
"A ninja is a silent wraith with a razor-edged blade in one hand and a scaling-grapple in the other. Ninjas can penetrate the most sophisticated defense and leave without a trace. They are mystic swordsmen, spies, acrobats, quick-change artists and conjurors. Most people will tell you that ninjas don't exist. That's exactly what the ninjas want you to believe."