Talerian

The Talerians were a race of aliens from the planet Taleria.

Biology
Talerians were the same height as humans, but with grey-green skinned, blobby bodies covered in slimy pustules. Their heads were bulbous, with a slit-shaped mouth full of razor-sharp teeth, and a single, egg-shaped eye. They had no necks. Their skin was rubbery, able to deflect small impacts. More powerful attacks, such as a knive wound, or a change in atmospheric pressure, would rupture the skin, causing the Talerian's liquid innards to gush out, killing them. With each passing generation, the Talerians grew more and more fragile.

Technology
The Talerians wielded laser blasters capable of stunning or killing. They also wore armour to protect their frail bodies.

History
A group of Telerians invaded Base Diana on the Earth's moon in 2010. One of them followed an unintentional signal from the mind-altering experiments of Professor Jackson. Taking over Jackson's body, the Talerian used his mind-altering device to transmit the minds of the rest of his kind into the more robust human bodies, sabotaging the base's quantum displacement travel system to prevent discovery by Earth authorities. The takeover was stopped by the Eleventh Doctor, who restored the minds of the humans. Jackson, his mind returned, sacrificed his life to shatter one of the base's windows, causing a pressure drop that ruptured the bodies of the Talerian invasion force. (NSA: Apollo 23)