The Doctor came too in an infirmary in the UNIT base. He moved to sit up before flopping back down to the bed. He looked around, spotting Amy and Harry at the door. What had happened? He took a moment to think about it, then he remembered; he'd been shot. As he was left pondering what he was like now, Amy spotted he was awake and walked over to him with Harry close behind.

"Okay, give it to me straight." The Doctor said, not giving them a chance to say anything first "How do I look?"

"See for yourself." Amy said, picking a mirror up from his bedside table.

He was greeted with a shock; he was looking at a man in his early to mid twenties, long-ish black hair, blue eyes and a large chin.

"I'm still me?" He said "What happened?"

"We were hoping you could tell us." Harry said "When the TARDIS landed, you didn't come out so Amy used her TARDIS key to check on you. She found you unconscious so had us bring you here."

"What, oh, wait, yes, I remember." The Doctor said "I was shot. The sonic screwdriver's overload pulse combined with the jamming signal from here must have shorted the Sontaran weapon enough that it ended up at basically a stun setting. Wow, I just invented the stun setting on Sontaran blasters."

"Yes, yes, well done Doctor." Harry said "Now, I'd like to run a few tests myself before letting you go."

"Sorry Harry, we both know I can't let you do that." The Doctor replied, getting up and noticing his jacket was gone "Where's my jacket?"

"In the TARDIS. So's the sonic screwdriver." Amy said "I put that thing you built in there too."

"Good." The Doctor said "Hope you don't mind Harry, but it was going to be destroyed anyway. Might as well take it with me, could help sometime in the future."

"Of course not Doctor." Harry said "It's about time we all did something for you."

"Don't worry about it." The Doctor said "Now Harry, it's been a pleasure, but I have to go, but don't worry. I'll see you again. Maybe not like this, but I'll see you again."

Before Harry could reply, the Doctor had began walking off, Amy tossing back a good bye then jogging to catch up with him. A moment later, the sound of the TARDIS engines was heard over the beeping of devices and instruments in the medical lab.

…..

"Rightio, here we go again, the open road." The Doctor said to Amy as he danced around the TARDIS console "That is, if you want to come."

"I do." She said "Where are we off to?"

"I have no clue." The Doctor said as he pulled a lever "Let's see where we end up."

As he finished talking, there was a beeping coming from the monitor. The Doctor darted to it and looked at the readout.

"Okay, change of plans." He said, playing around with the controls again "The TARDIS has picked up a temporal distress signal. Coming from the 16th Century, Earth, England. 1539. Hold on, there's a message attached to it."

He pressed some controls, moving to the chair two feet away and rummaging around his jacket, pulling out the sonic screwdriver, pointing it at the monitor and clicking the button. There was a moment then a beat began coming through the monitor. A simple one, just the same note repeated four times, over and over again. Amy looked at the Doctor and saw he knew something about the rhythm.

"Doctor?" She said "What is it?"

"It's him." He replied "The Master. It's him, he's there, in 1539. He's calling me."

"But Doctor, he ran from you." Amy said "Why would he be calling you now?"

"I don't know." The Doctor said "But the damage he could do there is immeasurable. I need to go there. I'm sorry, but I can't take you home at this moment in time if you've changed your mind about coming with me."

"Wait, this is a time machine, can't you just take me back then go there?" Amy asked.

"No." He replied "If I take you home, I could lose the signal on the Master. It's now or never."

Without another word, he went back to the TARDIS controls and started altering their heading. There was no way out; they were going to face the Master…