I have written a few blog posts about what happens to body and soul when a person dies and how body and soul may get back together at the time of the Resurrection of the Dead (Techiat HaMetim).
I cannot help it but the whole subject reminds me of an older movie from the 1980s. The movie is called CHILLER and is about a dead guy waking up and coming back to life. His family is happy and excited to see him. However, very soon they realize that their “dead” relative has changed.
Quite a few people choose to have their dead body frozen or whatever you call this kind of procedure. These people think that, one day, doctors / scientists will be able to cure any illness and will be able to revive the dead frozen body. This may even be the case in the future but there is one thing, people forget to take into consideration: As long as a human revives a dead body, the dead person could come back to life but without a soul. Only G – d is able to return a soul into a formerly dead body (see the Resurrection of the Dead).
And in order to understand what it means to return from the dead without a soul you can watch the movie CHILLER.