DS9, Siege of AR-558. Season 7, ep 8
Now this was dark. DS9’s storytelling is unlike any other trek show, in that it uses long story arcs. Things that happen in one episode matter. We lose various members and crew and Nog loses a leg, an event that will effect him all season.
TNG,The Pegasus. Season 7,ep 12
Riker gets a little character development as he’s torn between his duty to the enterprise and his former commanding officer.