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The enemy vessel, that had damaged the Zohnus ship and killed all Zohnus onboard, waited patiently nearby, its crew biding their time. They had been in search of the Doctor for years. They had come upon the Zohnus ship and, after scanning it, had detected the Tardis within. Knowing the Zohnus were useless researchers, they were taken care of swiftly and with ease. Now, nothing stood in the way of their mission. The Doctor had destroyed their way of life and he would pay. The crew had seen, firsthand, what The Oncoming Storm was capable of. They knew that their only way of succeeding in their mission was to have something more powerful than the Doctor on their side. Luckily for them, they found a fragment of one such being. It was thought that this entire being had been destroyed, but the rumors were wrong. For one lone fragment of the being had survived and through the destruction that fragment would wreak, the crew would have their vengeance.
The Doctor and Sarah raced to the console room and once they arrived, the Doctor immediately began working on the repairs at a more feverish pace than she had ever seen. She could feel his fear as something palpable and couldn't recall him ever being this afraid, except for that one time. Oh God, no, not again, Sarah thought to herself as she began to slightly tremble at the mere thought of it. As she gripped the edge of the console, on the other side of where the Doctor was working, she asked with a quivering voice, "Doctor, what aren't you telling me?"
The Doctor momentarily stopped working, took his head out of the base of the console, stood up with his hands pressed palms down on the console, looked up at her, and stated, "The vessel that attacked and killed all the Zohnus are manned by a vile, warrior race called the Tunglia. I ran across them a few centuries back and there were certain things I had to do to save this other race of beings, a peaceful race, from the Tunglia. They are out for revenge and will stop at nothing until they have destroyed me and the Tardis. Despite all of this, they are not what concern me the most."
The Doctor looked down momentarily and took a deep breath to attempt to calm his nerves. When he looked back up at her, she could see his underlying fear and concern, but it was mostly masked by a look of grim determination. "The Tunglia have something in that vessel with them, a fragment of a being with enormous power. I sensed that power as soon as the Tardis informed me of the attack."
Knowing the answer, but needing to hear it anyways, Sarah asked, "Is this powerful being who I think it is?"
The Doctor nodded solemnly, as he heard her thoughts, and replied, "Yes, Sarah. Somehow, some way, a part of him has survived and returned for me." The Doctor walked over to Sarah and gently held her left hand, the light of the central column illuminating her ring. "I wish I could tell you more about this ring, but I haven't the time to teach you to mentally shield your thoughts from others. Therefore, I will need to do something you won't like. I'm sorry, Sarah." Before she could react, she felt his fingers on her temples and then she lost consciousness. The Doctor caught her before she fell to the floor and carried her to her room. After placing her gently on the bed, he took the ring off of her and began to place it on the ring finger of his left hand. It immediately changed size and shape to accommodate him.
He walked back to the console room, closed the base of the console. The main repairs have been complete, he thought to himself. The secondary repairs can wait until I return. He checked one final time to make sure the shield strength was still at maximum. Satisfied, he patted the console and said, "Watch over Sarah, Old Girl, until my return. If she wakes up before I return, do not let her leave." At the Old Girl's mental acceptance of the order, the Doctor put on his coat and hat, opened the outer doors of the Tardis, and stepped into the darkness of the Zohnus ship.
He knew that once he was outside the safety of the Tardis, the Tunglia would be able to pick up on his signal and transport him to their vessel. He was counting on that. He knew they didn't have the ability to transport such a powerful ship as the Tardis onto their vessel. Therefore, the Tardis was the safest place for Sarah. He knew he had made the right choice in leaving her out of this. There were certain things that only a Timelord could take care of. He had already given the Tunglia one chance centuries ago. They had not learned from their mistake and he would have to do what was needed to ensure they never followed after him again. As for my other problem, he thought as he allowed The Oncoming Storm to tap into the sheer, raw power of the White Point Star diamond of the ring, you don't stand a chance, Sutekh. A moment later, he was transported to the Tunglia ship.