"I'd like to see how Manning's tactics work on a female dasypus novemcinctur maximus," said Astro with a sly grin.

"A female what?" yelled Roger.

"A giant armadillo, Roger," Tom explained, laughing. "Very big and very mean when they don't like you. Don't forget, everything on Venus grows big because of the lighter gravity."

"Yeah," drawled Roger, looking at Astro. "Big and dumb!"

"What was that again?" bellowed the giant Venusian, reaching for the flip cadet. The next moment, Roger was struggling futilely, feet kicking wildly as Astro held him at arm's length six inches off the floor. The cadets in the car roared with laughter.

"Atom City!" a voice over the intercar communicator boomed and the boys looked out the window to see the towering buildings of Atom City slowly slide by. The train had scarcely reached a full stop when the three cadets piled out of the door, raced up the slidestairs, and jumped into a jet cab. Fifteen minutes later they marched up to one of the many ticket counters of the Atom City Interplanetary Spaceport.

"Reservations for Cadets Corbett, Manning, and Astro on the Venus Lark, please," announced Tom.

The girl behind the counter ran her finger down a passenger manifest, nodded, and then suddenly frowned. She turned back to Tom and said, "I'm sorry, Cadet, but your reservations have been pre-empted by a priority listing."

"Priority!" roared Roger. "But I made those reservations two weeks ago. If there was a change, why didn't you tell us before?"

"I'm sorry, sir," said the girl patiently, "but according to the manifest, the priority call just came in a few hours ago. Someone contacted Space Academy, but you had already left."