When I was a child I wanted to learn to play the guitar, just like my father. Until I learned what it would do to my fingers.
"Now you take this. That's an order, Doctor. Take the gun. You take the gun and save your life! And please don't die," Wilf says, beginning to weep. "You're the most wonderful man, and I don't want you to die."
Wilf weeps. He reaches out for the Doctor's hand, placing it over his own. The Doctor looks into his eyes and, crying, swears he can't. That there are limits to how much we can change, no matter what the world does twisting around us.
"A star fell from the sky."
"Don't you want to know where from?" the Master asks, broadcasting on every channel. "Because now it makes sense, Doctor. The whole of my life. My destiny. The star was a diamond. And the diamond is a Whitepoint star." The Doctor shakes beside old Wilf. "And I have worked all night, to sanctify that gift. Now the star is mine, I can increase the signal and use it as a lifeline. Do you get it now? Do you see? Keep watching, Doctor. This should be... Spectacular. Over and out."
The Doctor's fear becomes anger; he can barely explain to Wilf what the Master means. "It's the Time Lords. The Time Lords are returning." Wilf honestly thinks that's a good thing; nobody but the Doctor knows what they became. The Doctor picks up the gun, terrified at himself, getting dirty, and runs.
The Master holds his arms above his head, twirling, as the diamond activates in the Gate or whatever; the beat begins, four by four by four. The Doctor runs screaming into the Vinvocci chamber. Rassilon calls upon the Panopticon for a vote: "We die here, today, or return to the waking world and complete the Ultimate Sanction. For this is the hour when either Gallifrey falls, or Gallifrey rises!"
Gallifrey rises. Wilf wonders aloud: Weren't the Time Lords dead? Well, the Doctor explains about the Timelock, how he sealed them in a bubble forever. How they reached through time to drive the child Master mad, through the beating signal. "If they can follow the signal, they can escape before they die." Wilf offers to throw a party, and the Doctor shakes his head: "There will be no party." He admits to romanticizing the Time Lords, remembering the best of them, but admits that endless war has changed them forever. "You've seen my enemies, Wilf. The Time Lords are more dangerous than any of my enemies."