I meant schadenfreude on my part.
You're right tho, they're aliens. I'm afraid they have a horrid fascination, there is so much that is left unsaid.
Did you watch the 1st new Dr Who? Plastic had gone evil and taken over the world. Billie Piper's boyfriend got eaten by a wheelie bin and spat out as a mannquein, it was hilarious. Maybe this happened to the Relocators?