History
Sally Kean was a government agent that was active in the 1940's who was close friends with US Marine Don Stevens (Secretly the costumed hero known as the Defender). When a number of Japanese spies were caught in New York City, she would investigate how they were making their way into the country. Stevens and his boy-sidekick Rusty would be assigned to accompany her, however they would sneak off to become their costumed identities and solve the mystery themselves. Sally would be captured by minions of Dame Kackle a human smuggler in the employ of the Nazis. She would ultimately be saved by the Defender and Rusty, who would ruin Kackle's operation.
Notes
It's interesting to note that Sally Kean very much similar to Captain America's wartime supporting cast member Betsy Ross. They are however, two different characters. The similarities are likely due to the fact that both characters were created by Jack Kirby and Joe Simon.