Breach

On the cusp of fatherhood, a junior mechanic aboard an interstellar ark to New Earth must outwit a malevolent cosmic terror intent on using the spaceship as a weapon.
A hardened mechanic must stay awake and maintain an interstellar ark fleeing the dying planet Earth with a few thousand lucky souls on board... the last of humanity. Unfortunately, humans are not the only passengers. A shapeshifting alien creature has taken residence, its only goal is to kill as many people as possible. The crew must think quickly to stop this menace before it destroys mankind.