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.
Tortoiseshell cats can be one of many breeds. These include the American shorthair, the British shorthair, the Oriental shorthair, the Persian, the Siamese, the Burmese, the Turkish Van, the colorpoint shorthair, the European shorthair, the Birman, the American bobtail, the Japanese bobtail, the Norwegian forest cat, the Maine coon cat, the Cornish rex, the Devon rex, the American curl, the Manx and the somali cat.