Weird Science #2

Unknowlingly, spaceship crews from the 2nd and 4th planets in the solar syatem meet by chance while exploring the 3rd planet, and a glitch in language makes each group retaliate. When the crews flee back to their home planets, each decides that the people of the 3rd planet pose a major threat to their own peace and security, and each decide to eliminate that planet before that can happen.