Nature can be pretty freaky. After all we have creatures alive today that have evolved over millennia to provide us with a never ending variety of life.
But nature is full of surprises as well, some of which we are only discovering now. The goblin shark is one of those surprises as it is a species of shark that is rarely seen by human and is considered to be an ancient species even by shark standards.
I'll leave it to the video of a rare moment when a goblin shark was caught on film to explain the Alien reference.
Thanks to Neatorama for the image and video link