The Collector of Wolds is a being that collects information and artifacts from worlds that are dying.
He attacked Krypton through their Brainiac 1.0 system and took Kandor for his collection.
The Collector also attacked Earth through the Internet and took control of factories to create robots. He also took over John Corben when he was joined with the Metal-Zero suit. He took a huge chunk of Metropolis for the collection.