I should have made it clear, that episode “To serve man” is a play on words, it seems that aliens visit earth and vow to serve man and people line up to get on the spaceship to go back to their planet.
But it is sort of a double-meaning, to “Serve Man” meant that the aliens were getting people to indeed, “eat”, the aliens mission was indeed to “Serve Man”.
See the original: http://farm3.staticflickr.com/2165/2130119407_f832099505.jpg
I probably didn’t need to post the picture but it seemed sort of related.
I remember the “To Serve Man” episode very well.
It think I was referring to a previous episode you mentioned.