I loved Perelandra. That Hideous Strength was totally messed up; naked guys worshipping reanimated corpse heads! Freaky. I did read all the Narnia books; I don’t remember them much anymore, but I do know that Dawn Treader was my favorite.
Dawn Treader and The Last Battle were mine. Hard to chose between them.
It was the evil guys worshiping the corpse head. Or heads. They were evil. The did bad things.