This Star Trek: Discovery article contains spoilers.

“I wonder what the Breen look like under those helmets?” asks Ezri Dax in the Deep Space Nine season seven episode “‘Till Death Do Us Part.” That’s a strange question, given that Ezri and Worf had been captured by the Breen and interrogated for some time. But despite their close and uncomfortable contact with the hostile alien species, neither hostage learned much about them.

“They say no one has ever seen one and lived to speak of it,” Worf answers.

Ezri continues in her usual lighthearted manner. “Maybe they’re all furry. It’s supposed to be very cold on Breen.”

“One thing is certain.”

“They’re horrible cooks?”

“They are dangerous,” responds Worf, with even greater gravity than the Klingon usually assumes. “They do not tolerate incursions into their space. During the Second Empire, Chancellor Mow’ga sent a fleet of...