Vale made it his life mission to find out all about superman who he was were he came from and what was his weakness. When Vale found a fatally wounded man named john Corban he took his brain and transplanted it in a robotic body powered by a Kryptonite heart. Once Corban awoke and found out what was going on he killed Vale and then went out to kill Superman.
Batman v Superman: Dawn of Justice
Prof. Emmet Vale will be played by Ralph Lister. Unfortunately, the movie gives no other implication but its a good chance Metallo will make an appearance soon thanks to Prof. Vale.