Dark Angel, Season 2

Logan:
But he believed it. They all did... except for Max, and eleven of her brothers and sisters. They wanted out so much they escaped, and they've spent the last eleven years defending their freedom with their lives. That barcode on the back of their necks? That was put there to keep track of them, like a brand. So when she sees someone like you, eager to be a slave, wearing it... it kills her inside.