Re: Who should play Brainiac?
Corey Burton's voice attached to a CGI creation - based on either the '80s Ed Hannigan "Super Powers"-era design or the New 52 insectoid "Collector".
Seriously, the less he looks like a green man in pink, the better.
"My folks came to the U.S. as immigrants, aliens, and became citizens. I was born in Boston, a citizen, went to Hollywood and became an alien."