"Grandfather!" Susan shouted, sitting up in her bed. "Grandfather!"

The Doctor appeared at the door and ran to Susan's side. "Hush, child. I'm here." He noticed her trembling frame and harsh breathing.

"Oh, Grandfather!" she sobbed, grabbing onto him tightly. "I dreamed I was back on Gallifrey. A giant monster killed Mother and Father and was about to come after me. It was horrible."

"Shh... it's okay," said the Doctor, trying to calm her. "You're okay now. It was only a dream; dreams can't hurt you."

Still clinging tightly to him, Susan said, "I know my parents are gone, but why must we live in fear still? Why must we keep running? I hate it so." She suddenly turned her head up towards the Doctor, meeting his eyes. "Will we ever see our home again?"

"No," said the Doctor. "I'm afraid not. We can never go back."

Susan finally let go of her grandfather and sat up, leaning her back against the wall. "I think about it from time to time: the burnt orange sky, the silver leaves, the Citadel, the Time Lords. I miss it. Don't you ever miss it, Grandfather?"

"Sometimes, yes. But other times, all the new worlds we see, the new cultures, new ideas, I don't mind being here so much. Think of all the adventures we've already been on, hmm? The Time Lords had a great opportunity, and they squandered it by hiding from their responsibilities. We have the power of time travel, yet there are those who have never ventured beyond the Citadel by themselves." The Doctor was becoming steadily angry, but then he paused, deep in thought. "Susan... I want to tell you something..."

"What is it, Grandfather?"

"If we ever return to Gallifrey, it would mean almost certain death. Even if they pardon us."

"I don't understand what you mean."

"If we return, and they decide to spare us, we would be forced to live by their rules. We could never challenge them. Never tell them that they're wrong. We'd be tied down, never free from their grasp. I can't let that happen to you. I want you to learn to be strong, to fight, not just for yourself, but for those who cannot do it themselves. You're a Time Lord: all of history crouches at your feet. The universe is so vulnerable, Susan. We must... we must protect it. Promise me you'll protect it."

"I promise, Grandfather," said Susan, gravely, realizing the importance of her words.

"Good girl," said the Doctor, patting her legs covered by the blanket and standing up. "Now, why don't you try and get back to sleep, aye?"

"Okay, Grandfather," said Susan. "Goodnight."

"Goodnight, my child."