When Tom Corbett and his Polaris unit mates, Roger and Astro, were assigned to the great expedition of one thousand space ships carrying pioneer colonists billions of miles to the satellite Roald, they did not dream that they were facing the most thrilling adventures of their careers.
and report to Commander Walters for your assignments. Tell him I'll be there in a few minutes."
"Yes, sir!" said Tom, and the three cadets saluted sharply.
"Unit--" bawled Strong, "dis--missed!"
Outside in the hall once more, the three cadets wiped their faces.
"Captain Strong definitely was not in a good mood!" commented Roger.
"I've never seen him so angry!" said Tom. "Wonder why."
"Think it might be something to do with our assignments?" asked Astro.
"Never can tell, Astro," said Tom. "And there's only one way to find out. That's to get to Commander Walters' office on the double!"
Without another word the cadets hurried to the slidestairs, each of them hungry for excitement. Already having participated in three outstanding adventures, the cadet members of the Polaris unit were eager to begin a fourth.
"There's no doubt that the s