To Serve Man by Damon Knight

Features: Narration in two voices; sound effects; background music

The sound effects overshadow some narration:

They said they were to serve man. . .  
And give many gifts and make world peace

But something was still missing. . .
What could they want in return?

They proved their good intentions. . .
But it was too good to be true

From author Damon Knight. . .
comes the best sci fi short story ever – To Serve Man