Bryan Cranston as Brainiac
Brian Cranston is no stranger to playing chrome-domed criminal masterminds, and in the role of Brainiac, Cranston would surely bring his patented bad-guy charm to a whole new level. Also Braniac is a villain that hasn't been given a proper on screen treatment, and the character will definitely make a formidable foe in any one of the inevitable spinoff movies this series will produce. Like, for instance, how awesome would it be to see Cranston as Brainiac take on Benedict Cumberbatch as the Flash? Don't even attempt to answer; words have not yet been created to adequately describe how freaking amazing that would be.