The series is based on the popular New York Times bestselling book series collectively known as The Expanse,  written by Daniel Abraham and Ty Franck (under the pen name James S. A. Corey). Abraham and Franck will be show producers.
A tortoiseshell cat is a coat color where the cat is a molted brown cat with black, reddish, or orange patches. They can also have white paws. Tortoiseshell cats have unique genetics. The vast majority of tortoiseshell cats are female, because two X chromosomes are required to produce black, gold and orange coloring.
The color tortoiseshell, which is the mix of the red, orange or brownish color and black, without the white, or with only a tiny amount of white, is also predominately seen on female cats. Curiously, most calico cats, as it turns out, due tend to have similar personalities no matter the breed.