In order to make Izaak Walton's sport complete, there must be an angler, a fish, and some bait. All three existed on Arz but there was a question as to which was which.
A fearsome thing is a thing you're afraid of--and it has nothing whatever to do with whether others are afraid, nor with whether it is in fact dangerous. It's your view of the matter that counts!
In exchange for the promise of an almost limitless fuel, earth agrees to allow the alien Grdnzth people to gather on earth for transit to a planet as their is going to be destroyed. The Grdnzth are ugly, looking rather like reptiles. They also pop in anywhere, anytime unannounced. It's the job of PR men Pete Greenwood and Tommy Heinz to get the public to accept the Grdnzth and the inconvenience...
At least a contributing factor to the current cycle of science fiction movies being made in Hollywood is the touchiness of minorities having their nationals being portrayed as villains. Cinema-makers are now trying to avoid further boycotts by using space aliens for villains. But suppose some of our Extraterrestrial neighbors are also a bit touchy?