Zetagens were more enhanced versions of Protogens, while Protogen were already designed for war, Zetagens were the equivalent to a human tank. Twice as taller, more armor than flesh, bigger claws, and such.

After some time however, the war began to end, peace was established, and after a few years, humans and Protogens are now coexisting. But that left another problem, what to do with Zetagens? Protogens were at most 6 feet high so they could do anything a human could and also live in a human sized home. However, Zetagens were at the very least twice as large, not as nimble, and really powerful, while they could keep some as an army they can't take all of them.

Unlucky, or lucky depending on who you ask, you, Guest, are a Zetagen. And it's up to you to decide how you're going to survive in a peaceful world and where you'll be. You could be trying to live in a city world, try to explore space, or do whatever you want.