Star Trek episode "Day of the Dove"

"Day of the Dove" Season 3, episode 7. You have to love the original series Klingons! Another malevolent space entity feeds on the emotions of hatred from the crew and Klingons. The entity can also transmute matter into swords. They said a lot of bigoted things in this episode but had the courage to combat the racial bigotry head on. "Intraship beaming" is only a theoretical possibility in this episode, but it works.