The second half of the story tells the heroic tale of how the space-bound Cheela, with a little help from the humans, eventually are able to land again on the surface, defeat the barbarian tyrant, and start to rebuild Cheela civilization.
The second half of the tale describes the heroic account of how the space-dwelling Cheela, aided by humans, are able to set foot back on Earth, overcome the brutal ruler, and start the journey of rebuilding Cheela civilization.