User blog comment:Xandermcc/More Arrowverse PSA's?/@comment-24695878-20170216205520/@comment-3221148-20170223192517

Speaking of Cyborg Superman, the new version of him works very well as Supergirl's arch-enemy, what with being her father edited by Brainiac and all that.

Considering Supergirl already established that her dad was... not the nicest scientist on Krypton, they could go that route.