Them(2007)

Them is a science fiction series following a covert alien sleeper cell operating in modern-day Los Angeles. The extraterrestrial agents arrive emotionless and obedient, unaware of their true mission on Earth. But something goes wrong: human emotion acts like a dangerous virus on them, destabilizing their rigid programming. As a few agents begin to feel, their newfound capacity for connection threatens to unravel their entire operation. The series explores what happens when beings engineered for detachment encounter the messy, unpredictable force of human feeling—and how those feelings might ultimately transform them in ways their creators never anticipated.