Registering my guess, with no supporting evidence, regarding Hank Henshaw:
Some people have speculated Henshaw may be the Martian Manhunter, on the strength of nothing more than a flash of red eyes and a comment that he "used to" have a family.
In the comics, Hank Henshaw became the Cyborg Superman after his human body was disintegrated by radiation; he beamed his mind into the birthing matrix that carried Superman from Krypton to Earth as an infant and constructed a cyborg body in the image of Superman. I'm going to go out on a limb and guess that Kara's ship, which we know the DEO has on hand, was at some point involved in transforming Director Henshaw into a not-fully-human form.
Note that this is from a no-longer canon continuity in which Kryptonians aren't naturally born, and Kal-El was shipped off planet as a developing fetus, rather than a young child.