Procurando o título da história curta, os viajantes chegam a Urth procurando ajuda de uma civilização avançada, contra alienígenas, descobrindo Urth habitado por agricultores essencialmente atrasados.
No final da história, as pessoas concordam em ajudar, movendo o planeta para seguir os alienígenas até em casa.
Este é o de Alan Dean Foster "Com amigos como estes"(da coleção de antologias de mesmo nome):
“You have done us a very large favor, gentlebeings, and we are oh, so grateful! How many years we labored to find the answer to the Shield, how many years, only to discover that it could only be applied, or retracted, from an outside source. Now that it is down, we will not make the error of allowing it to be put up again. Once again, gentlebeings, we are in your debt. Our agreement still holds. If you will return to your ship we will… commence preparations to follow in ours.” The native smiled, and it was at once a lovely and terrible thing to see. (Among the known creatures of the universe, only the Terran human bares its fangs to express friendship.)
[mais tarde]
In the middle of the planet’s second ocean, great, impossible masses of thick columnar crystals began to leap upward from the waters. Translucent at first, the chalcedony towers began to pulse with deep inner fires: blue, purple, gold, carmine, and finally a strange, yet familiar silver-gray. The ionosphere, tickled, began to surround the flashing needles with auroras, clothing them in blankets of coruscating radiance. Following, the planet began to move after the Tpin. On board the cruiser it was very quiet.
“I see,” whispered Rappan idly, “that they are bringing their moon along also.”
“You get accustomed to something like that,” breathed an engineer. “A moon, I mean.”