In Legends of Tomorrow, Dr. Nate Heywood will be a historian whose grandfather fought in World War II as Commander Steel in the Justice Society of America.
His grandfather, Henry Heywood, was introduced in 1978 as a super strong hero who fought during World War II as Commander Steel.
In the final minutes of the Legends of Tomorrow Season 1 finale, Rex Tyler, a.k.a.
Hourman, found the remaining members of Rip Hunter’s time traveling team and introduced himself as a member of the Justice Society of America.