Leading Idea

 Two alien explorers land on an undiscovered planet believed to support life. The two get out the starship and explore. When the main character is pointing at something and speaking to his friend about it, he turns around when he doesn't get a reply. To his horror, he sees his friend getting dragged away by a hideous creature. Terrified, he runs back to the ship. He tries to start up the starship however it is out of fuel! He is now very scared because he is trapped on the planet with the creature. After days of hiding in his starship, he finally gets the courage to go off and find the element needed to make the fuel. He gets out and uses a gadget to locate the element. He searches the planet but he can't find the element. When he is just about to give up, the gadget locates the element. He follows the signal. When the signal is at its strongest, he looks up hoping to see it in front of him. However, he is face to face with the creature that killed his friend. The creature's blood contains the element. He manages to defeat the creature. Then, his friend appears. He is alive! The two then use the creature's blood to get off of the planet. 

>Planet could be flat (a nod to flat earthers).