The X5 Series supersoldiers are a group of elite, genetically-enhanced supersoldiers in the television series Dark Angel

The X5 Series was the first successful prototypes of a project to create perfect physical, mental, and psychological commandos, which could be utilized for a wide variety of Special Operations assignments and missions. Bred, trained and raised by Manticore, a sinister top-secret military institution controlled by a shadowy government "Committee", all X5's are human/animal-transgenic-hybrids, or Chimeras. They were genetically-engineered at Manticore's highly advanced genetics labs by splicing together genetic samples taken from numerous superb human specimens with a sample of feline DNA, most probably taken from a member of the Leopard or Tiger family.