But, of course, the big reveal in this episode is seeing Denise Crosby return as Sela, a Romulan Commander. Which I suspect must have been quite the surprise for people watching this show for the first time back in the day.
When Ron D. Moore first heard about the idea to bring back Denise Crosby he just said it's insane, having already killed that character twice and she was still coming back.
But apparently he was in search of a really good cliffhangar ending / surprise and eventually warmed up to the whole idea.
IIRC, the actress in "The Mind's Eye" was retroactively dubbed by Denise Crosby.