"So what are we going to do?" Rose asked as they sped out of the booth. The Vigilante glanced at her, his eyes purposeful. "We need to get rid of them, preferably for good." The Doctor stopped him, his hand on the Vigilante's chest. "We need to be careful. They may be the last of their kind." The Vigilante turned to him, a sneer on his face. "They're willing to kill millions of people for their own benefit. I don't care if they were the last living beings in the universe, I'm still going to make them pay."
"It wouldn't make a difference. They've already altered human history."
"So we go back to when they first crash-landed, and take care of them then."
"Take care of them? These are innocent people, who just crashed on an unknown planet, and did what they could to survive! You don't need to kill them." The Vigilante leaned closer. "You think they're innocent? I did a bit of snooping of my own in that booth. The ship that crashed a decade ago? It was a maximum-security prison ship. I read the security tape transcripts. The prisoners escaped, killed all the guards, and crashed the ship on Earth. Doctor, these are criminals who would not only kill millions of people for greedy purposes, they would enjoy it as well. They are far from innocent!"
"I won't let you start a war!"
"It's not going to be a war. It'll be an execution." The Vigilante turned and stormed back into his TARDIS. The Doctor followed him, his face set in a snarl. "Oh, this should be interesting," Rose muttered as she walked through the TARDIS's doors.