Ten best Star Trek: The Next Generation episodes
"Sins of the Fathers"
Everyone loves Worf (Michael Dorn), and the taciturn, turtle-headed Klingon gets a real chance to shine in this season three episode. A Starfleet-Klingon exchange program puts a Klingon named Kurn (played by Tony Todd) on the Enterprise and sends Commander Riker (Jonathan Frakes) to a Klingon ship. It turns out that Kurn is Worf's little brother and before long Worf is headed home to defend his family honor against charges of treason. Naturally, it turns out to be a much more complicated issue than it seems at first glance, but by the time Worf decides to take one for the team and accept dishonor rather than upset a delicate status quo in his homeworld, he (and the audience) learn a fair bit about his family and cultural history, Picard gets to be a stand-up guy and, Riker manages to hit on some Klingon women. That's a win-win-win, and it sets up a great season four/five storyline as a bonus.