Harry Kim falls for a holographic character.
Harry Kim becomes infatuated with a holodeck character and becomes so obsessed that it affects his work. Tuvok helps him in the effort to forget her, but the situation becomes more complicated when the crew discovers that she is more than a program.
The episode is a light, romantic story that puts Kim in the center, and it offers an unusual look at Tuvok as a teacher of emotional discipline. It is also a clever take on the idea of loving someone who does not exist, and it plays with the ship's holographic technology.