In which cryogenically frozen twentieth-century humans followed Data home, and can he keep them?
Memory Alpha says: An encounter with the Romulan Star Empire is complicated by the presence of three Humans rescued from an ancient cryoship. (Please click the Memory Alpha link for detailed information.)
I do not remember this being an exciting or dynamic season finale. In fact, pretty much all I can remember about it is ‘there were some frozen people they defrosted.’ I am sincerely struggling to recall any Romulan involvement to speak of. It will be interesting to find out what the episode is actually like.
So without ado beyond noting the fact that going back to the Khan well in any way worked exactly ONCE, and it was called Star Trek II: The Wrath of Khan, let us begin.