If We Fight Like Animals…
The Master was feeling rather pleased with himself. He'd seen his old foe destroyed, overcome a primeval power, and was about to take the Doctor's TARDIS for his own. Sure, it wouldn't have the navigational accuracy the one taken from him by the Time Lords did, but at least he'd be free to wreak havoc upon time and space once again. He would miss having the Doctor around to be the Sherlock Holmes to his Moriarty, but still, times change, he mused.
"Good hunting?"
The sudden question caught the Master by surprise, and he dropped the TARDIS keys, stepping back from the battered old police box. Out from behind the time machine stepped the Doctor, glaring at him in the stern manner that had become signature to his current incarnation.
"Yes. It would have been too easy," he replied, "It seems we must always meet again."
"They do say opposites attract," retorted the Doctor, not breaking their stare.
"But this is the end, Doctor," warned the Master. "Do you see it?" he questioned, his eyes becoming catlike, "It's the power: the power from that planet. It's growing within me… Are you frightened yet?"
"No" came the Doctor's response.
"You should be," warned the Master, "You should be, it nearly beat me. Such a simple, brutal power, it nearly destroyed me, a Time Lord, but I won. I control that force, Doctor, and now at last… I have the power to destroy you!" The Master then leaped at the Doctor, using the power of the Cheetah People to teleport his prey back to the planet.
The planet was still the barren wasteland they were familiar with, but it was even worse now. Gasses and lava spewed from cracks and splits in the ground.
"Welcome to my new home, Doctor!" exclaimed the Master, choking the Doctor on the ground.
The Doctor, despite his small and somewhat weak-looking stature, was a Time Lord in his prime, though, while the Master inhabited an aging Trakenite body, so the Doctor managed to push the Master off. Pinning the Master down, he grabbed a nearby skull, and raised it, preparing to slam it down on the Master's head. He looked up to see a pack of Cheetah People fade into nonexistence.
He realized, suddenly, that if he killed the Master, then he could very well be trapped on this planet. He then thought of Ace. What would she think of him, if he murdered the Master in cold blood?
He quickly remembered that the Master had killed countless people, and decided there was one way to stop his evil for good. Thinking back on his previous actions in his seventh incarnation, he recalled that he tricked Davros into destroying both himself and his Daleks with the Hand of Omega, and then that he pulled the same trick with the Cybermen. Ace didn't seem to have a problem then. Looking at the villain below him, he came to a decision. He decided there and then that he would finish off another evil that plagued the universe. Giving a primal growl, he smashed the skull down on the Master's face. He heard the Master's skull crack and the squelching of his brain being squashed. Tossing the skull aside, he looked down and saw the Master's flattened face, his blood staining the dirt.
"Goodbye forever, old foe," he said, getting off the corpse of his rival, as the planet tore itself apart around him.
Author's Note: Yes, this is VERY dark. Not really my style. Bear with me, I'm trying to get over a bad case of writer's block. I was watching LastWhovianTrailers on Youtube (excellent channel by the way, check his videos out sometime), and one of the clips of a fan trailer came from this story, in the scene where the Master and the Seventh Doctor battle on the planet of the Cheetah People. I then thought, What would have happened if the Doctor killed the Master? This story came from that thought. If this story gets enough likes and positive reviews, I will write a second chapter.