Modern fantasy and fiction has Zombies, Vampires, ghosts, necromancers, etc, but how did the Romans think of the undead? Did they have these same or similar tropes and arch types? Did they tell horror or fantasy involving these things?
In reference to this question specifically, I'd like to add that we have one really interesting source on Roman conception of necromancy, which is the story of the witch Erichtho's raising of a dead soldier in book six of Lucan's Pharsalia (relevant passages here - really worth a read!). It picks up on many of the ideas of necromancy that we see in the PGM and Ovid and other Greco-Roman sources on this sort of magic. Necromancy is almost always figured as something foreign (particularly Thessalian), not something that happens in good civilized places. Necromancy is often described, not quite like zombies or full reanimation, but as a way that the magic user can create an assistant, often, as in this case, for prophecy. And it certainly is meant to be something fantastical and horrific.