ST:TNG, Homeward, Episode 713
Medium-quality episode. We're introduced to yet another previously-unmentioned (I think) member of Worf's adopted family. And they have a really weird relationship. Whatever. Normally I'd skip a blurb about this one, as it's kind of a filler episode, but I wanted to bring the attention the fact that Worf has to undergo facial reconstruction surgery at least 3 times to maintain a disguise amongst a pre-Warp culture.
Also, awesome that Picard goes so far in upholding the Prime Directive to let an entire planet and its indigenous culture die in plasma storms. Less awesome that it comes to light, after all the bullshit people have pulled with the transporters in the past 6 seasons, nobody has put a password on them.
Seriously. O'brien? Worf? You are goddamn idiots.