Christian was trying to find his way to Waldo. Paul shouted:

"A radioactive cloud is approaching!"

The leader of the star men gave a command: "Into the ship - hurry!"

The star men began to get into the ship. The Brains continued to struggle with the insects.

At last Christian stood face to face with Waldo. Waldo aimed his decapitator at the captain, but he was half mad because of the continuous noise in his head - and missed. Christian shot at him - and the Brain fell dead.

Christian heard Paul's voice and ran towards him. Paul erected his energy barrier to protect them from the radioactive cloud.

"Return to your own time," the Watcher shouted to the Brains. "You will be safe there."

The Brains hesitated for only a moment. They had lost their leader. The terrible high-pitched sound never stopped in their heads. They were afraid of the radioactive cloud, and the giant

insects were attacking and killing them. They touched their crystals and disappeared…

Christian and Paul were standing in the valley and looking at the star-ship

"This is a historic moment," said Paul.

The ship rose a little, great flames of fire appeared under it. Faster and faster it was rising - and in a few seconds disappeared in the dark sky.

"It is over," said Paul. They looked at each other and smiled.

"Do you think the Brains have returned to your time?" asked Christian. "I think so." said Paul, "but I shall make sure as soon as I have taken you back to your own time."

He touched the crystals on Christian's and his own belts - and then Christian found himself on the bank of the Thames near his yacht. It was dirty and greatly damaged. But it was all right, he thought. The great and most important thing was that the Brains were no longer there. As to the yacht, he would repair and clean it.

Paul appeared beside him.

"All the Brains are in their time," he said. "Now the only thing I have to do is to destroy their time machine. I shall do it at once. So - I must say good-bye, Captain"

Christian took the crystal off his belt and gave it to Paul. He felt that he must make a speech, but could not find words.

"Thanks," he said. "Thank you for all you have done - from all the people of Earth."

They shook hands.

"Now you can be sure of your future," said Paul. "So - good-bye and good luck to you."

He touched his crystal and disappeared.

Christian stood a long time, looking down at the Thames and his yacht. The adventure was over. At last people could breathe a sigh of relief. He felt good. He thought about his friends - Doctor Fox and Jo, who were waiting for him.

He turned and walked away.