Okay kiddo, so basically there is a series of movies called "Advance Party". In these movies, a group of people called the "advance party" go to a new planet before everyone else to get it ready for them.
Kind of like how mommy and daddy sometimes go to a new house before we move in to make sure it's clean and everything works properly.
But in the movies, the advance party is also looking for any dangers or things that could harm the people who are going to live on the new planet.
The movies are all about their adventures and the challenges they face while exploring and preparing the new planet. Does that make sense, my dear?