While it's easy to assume Brainiac is always evil because he is a villain in its core, the actual explanation is a little more complicated. It was shown in JLA: Earth-2 that when a Brainiac from ...

When Lena Luthor (voiced by Aisha Tyler) has a falling out with Brainiac over protecting Harley, she decides to expose his plans to Daily Planet editor-in-chief Perry White. However, Perry turns ...