Breach

A seasoned mechanic finds himself tasked with staying alert to keep an interstellar ark operational as it escapes a dying Earth, carrying the remnants of humanity—just a few thousand fortunate individuals. However, unbeknownst to them, a shape-shifting alien has infiltrated the ship, intent on causing as much destruction as possible. The crew must act swiftly and strategically to eliminate this threat before it annihilates the last of the human race.