If you have never seen it, you should watch the British television show Red Dwarf.
There is a character named rimmer who is dead and has been brought back as a hologram.
Relatively early on in the series, through some Star Trek fuckery he manages to bring another version of himself back and begins to cohabitate with himself.
Aside from that, if you even reasonably like science fiction or comedy then it's a damn good show to watch. It's been running for 12 or 13 seasons, it started back in the '80s, and as far as I'm aware there is another season scheduled to be released.