Q: Does Evil cause the Keeper that it’s attached to not to work?

A: No. (If that were the case, the card would say so.)

Thematically, it actually works quite well, sometimes BETTER if the Keeper is Evil. I think if you were using the Dark Side of the Unseen Force you’d be even more likely to mess with people’s heads. If you were a Bad Guy Space Captain it would be totally in character to shanghai other people’s Crew Members. And just because you’re an Evil Engineer doesn’t mean you can’t fix that Malfunctioning Robot – I mean, it might be your Killer Death Robot. You could be an Evil Doctor seeking to eradicate the peaceful Brain Parasite species. See, it totally works.