The Flash2014

Dr. Martin Stein:
This is our earth. Let's call it Earth-1. And this second earth, let's call it Earth-2. This is where Jay claims to be from. And these other earth, three, four, five, to infinity, all of them, are nearly identical to ours. And they all exist at the same time, giving us endless alternatives to what we have here. For example, the Joe West on Earth-2, your doppelganger, he might not be a detective. He could be a Nobel Prize-winning physicist. And you, the Barry Allen here is The Flash, but over there, he could be an electrician.

Detective Joe West:
So, I'm assuming that the people on all these other earths work to make money to pay bills and such.