From Newsgroup: rec.arts.startrek.misc

In TNG Schisms, the crew encountered these strange clicking aliens that abducted members of the crew for strange experimentation. They were never
seen again in canon, but in several books, comics and games, these mysterious creatures return. But just what are they? And what did they want?

https://youtu.be/Zv5F_vM9iwQ?si=ZwtkVsyd0lcwblJ9

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