15 Greatest Justice League Villains Of All Time

2. Brainiac

Another villain who started off primarily as one of Superman's foes, Brainiac's goals have expanded in recent years, leading him to clash with the Justice League. Utilising many types of forces to achieve his goals, this sinister A.I. has sent everything from aliens to robots and monsters into battle against the League as he attempts to add either them or Earth to his ever growing collection of organisms from across the cosmos.

Brainiac is actually obsessed with shrinking and abducting civilisations, but his mad schemes aside, the fact he's both insanely powerful and intelligent are what make him truly frightening. As well as being one of the smartest characters in the DC Universe, he also has telepathy powers and more than enough strength to best the Man of Steel in battle, so it's no wonder Superman now brings the League with him when they clash!