I think that the confirmation that all of the people the Collector turned into puppets were conscious and aware the entire time may be the darkest thing in the entire series. Not only the fact that they were forced to watch everything in a completely powerless state, but imagining what that could have felt like. Could they feel their bodies as they were being manipulated, sometimes into unnatural and likely painful positions? Can you even breathe in that completely frozen state? Even if they weren't in pain, what must it have been like to be so confused and scared and not even be able to move your eyes to figure out what happened to you? The series plays with darker themes a lot but holy hell the implications of the puppets have been haunting me.