10 Smartest DC Characters
2. Brainiac
When you can pilot a ship that has the ability to shrink entire cities down to a size that means you can stick them in bottles, then you've got to have some serious grey matter going on up there.
It also doesn't make a difference which Brainiac comes to town, as each one has an immense thirst for knowledge, as well as for upgrading themselves with the best technology they can lay their hands on, meaning that when the purple and green one shows up, mass destruction is never far behind.
He has fought Superman countless times, and was even responsible for the Doomsday Wars. Seemingly not wanting to be pigeonholed as a one hero kind of villain though, he has even faced off against the Green Lantern Corps and the Justice League on numerous occasions.
He has upgraded himself and his ship, over and over, and travels galaxies in search of worlds that he can drain of knowledge, before atomizing the hell out of them.
He has been a kidnapper, an actual computer, and responsible for Krypton's destruction amongst other things, and all of it has been done by a creature with a twelfth level intellect.