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.
1 The Calico Cat is essentially is a tortoiseshell coat pattern with added white sections. 2  They are white, but with red and brown patches. 3  They differ from the Tortie Cat in that the black patches are solid, but like the Tortie, the coat pattern can also include tabby markings in the red patches.