Mercurian energy beast
From Tardis Wiki, the free Doctor Who reference
Natives of the planet Mercury, the Mercurian energy beasts were fearsome-looking creatures with hot, lava-like appearances and facial fronds resembling beards. As witnessed by the Eleventh Doctor, Amy Pond, and Rory Williams in the 367th century, they were actually peaceful beings who welcomed the Humans to the planet; they even went on board a mining rig and took the crew to a place of safety when they were exposed to a lava geyser about to erupt directly beneath the rig. Able to power the rig without being in direct sunlight, (usually needed to power and protect the rig and crew from temperatures of 427 degrees centigrade) the Mercurian energy beast helped the humans find mineral deposits on the planet. (COMIC: Hot Stuff!)
