David Cortez, a decorated US Marine, is now on the run from his own government after escaping a top-secret CIA lab when an experimental medical procedure turned sour.

While lying low in Mexico, an assassin sent from British Intelligence tracks him down. However, Sonny from MI6, a British-Iranian with a cockney accent, offers David a choice: join his team, or be killed.

David chooses to work with Sonny, not only because he wants his life back, but because he feels a kinship with the man.

They're also both in the unique position of being the only living test subjects with alien DNA in their blood. Could that explain the strong attraction between them?