TNG Episode: The Nth Degree.
A reminder that Dwight Schultz is a very capable actor. Portraying Lt. Barclay with that slight social awkwardness, the bad and uncomfortable acting as part of his attempts at personal growth.. Followed by confidence and capability after having his brain tweaked by an alien probe. Emotive acting that moves the audience, making a pass at Troi (a good one), and then the aftermath. The feeling "smaller" after having understood so much, the melancholy of it all.