Matt Damon is lost in space, and it's up to Donald Glover and Kristen Wiig to bring him home.

Well, them and a few other big-name actors and dozens of NASA officials in "The Martian," one of the most-anticipated films of the fall. Ridley Scott's newest sci-fi film, based on the popular book, casts Damon as an astronaut struggling to survive on Mars after an accident strands him there.

Wiig and Glover play key members of the team charged with coming up with a plan to bring him back to Earth. In this exclusive clip, we see them work out their plan using science, big words and (naturally) a pen click to the face.

Watch the clip below. "The Martian" hits theaters Oct. 2.

The Martian EXCLUSIVE - It Checks Out