Creature X

You are part of a groundbreaking interstellar expedition. Using a new, highly advanced spaceship with a cryogenic stasis chamber, your group of pioneer astronauts (make up their names, etc, as you wish) have managed to reach a planet in another star system. The planet is tidally locked to its star, which means that one side of it is pretty much always lit up and scorching hot; while the other is frosty cold and shrouded in eternal night. You land on the dark side of the planet, hoping to avoid the blazing heat of the sunny side. What you and your team of astronauts have no way of knowing is that advanced life exists on this harsh world, and not just a life, but a deadly predator, evolved and adapted to its environment - living and hunting in never ending darkness. Blind, but skillfully orienting itself through echolocation. It finds and tracks its prey (mainly smaller mammal type animals that also exist here; as well as its own kind, on more desperate occasions) with the aid of highly attuned senses of hearing and smell. It has razor sharp teeth and claws that tear through flesh like butter and crush bone with ease. Its tail is tipped with venomous spikes. Its muscular legs can propel it to speeds of over 140 km/h (faster than the very top maximum running speed of the cheetah, Earth's own fastest predator). And its greenish blood corrodes any matter it comes into contact with like a highly potent acid. There's a pack of them in your area. And they now know you're there. These creatures know no mercy or remorse. They are relentless hunters. And you are now their prey. Good luck.