Breach

“Deep in space they are not alone.”

Noah (Cody Kearsley) is a mechanic kept awake to maintain an interstellar ark carrying a few thousand survivors away from a dying Earth. He is not alone aboard, because a shapeshifting creature has taken up residence with one aim, to kill as many passengers as it can. John Suits shoots it inside the ship's tight corridors, so the crew has little room to run or hide.