Star Trek: 10 MORE Alien Encounters Before First Contact

Thanks to the Temporal Cold War, and the Temporal Wars in earnest, humanity came face to face with an alien race who closely resembled space vampires.

The Na'Khul, named only in production notes, were beligerents from the 29th Century. They travelled back to Earth's 20th Century in the hopes of winning the war in the past. Naturally, as often happens with malevolent aliens, they donned their best stormtrooper coats and sided with the Nazis.

The casual brutality of the Nazis suited their ends. They resembled a group of Mengeles, bent on using scientific research to advance their goals, even if it meant devastation to those affected. 

Thankfully, they were stopped by the crew of Enterprise, and history was set right again. This means that technically humanity both did and didn't encounter these folks before first contact. With that being the case, we'll leave them here, surrounded in the fog and intrigue that only those space vampires could achieve.