Two days out from Earth and without food the crew are forced to set down on a planet in search of food. Leela finds a very tasty food on the surface of the planet and they are quickly hooked bringing back a huge load to Earth.
Realising that they have something of value they begin selling them to the general population.
Leela is shocked when a poppler talks to her, after it was left out for a few days. The crew soon discover that popplers are the young of the aliens of Omicron Persei 8 and when the turn up the demand that the same amount of human young are to be eaten by them. A comprimise is meet and only the first person to eat a poppler will be eaten.