This is the second time a ship named Enterprise traveled to the center of the galaxy and met a big giant head that looks like an elderly white guy. It also happened in Star Trek V: The Final Frontier. Apparently earlier drafts of the script had the Cytherians being more menacing, but it was decided that it would make it too much like that film, and, to quote Ronald D. Moore, “The absolute last thing that we wanted to remind anyone of was Star Trek V.”