On Counterpart Season 2 Episode 6 – “Twin Cities”, the origins of the Crossing are revealed. You can watch the full episode below.
About the show:
What might be different if a person could co-exist in an alternate world? Howard Silk, a low-level agent whose career is winding down at a Berlin-based United Nations spy agency, unwittingly learns the answer. Upon discovering his organization is harboring a secret, that of a gateway to a parallel dimension, Howard becomes immersed in a mysterious world of espionage, intrigue, and government conspiracies. There, the only man Howard can trust is Prime, his almost identical counterpart from a divergent reality.