BEST 4. The Alien — 'Alien'
What would a movie alien countdown be without the original "Alien" herself. Long after Ripley (Sigourney Weaver) blasted the original Alien into outer space, the toothy monster still comes back for sequel after sequel after sequel.—Xfinity Entertainment Staff (Photo: Fox)
The opinions expressed are solely those of the author and do not necessarily reflect the views of Comcast.