The Thermians from 'Galaxy Quest' (1999)
Danger Level: 6 ("Waddya mean there are no retakes?!")
Cinematic aliens, be they good or evil, are often portrayed as superior to us mere humanoids. Sure, we may have our unquenchable spirit and joie de vivre and all that going for us, but in a science fair faceoff, most aliens can kick our collective butts. After all, they're the ones visiting us, right?
In "Galaxy Quest,' humanity gets the drop on the galaxy, and a kitschy human sci-fi program serves as inspiration for an entire civilization. To the Thermians, who recreate the world of the (fictional) TV show "Galaxy Quest" from old reruns, we're the guardian angels. Unfortunately, we kinda stink at it.
While the Thermians are decent enough, the rest of the galaxy seems rather peevish and hostile. Nevertheless, the combined dangers in "Galaxy Quest" only rate a 6 on our chart: Really, if a handful of washed-up actors can save the day, surely the rest of humanity is equal to the task.