Dr. Horrible watched in glory as the Double Rainbow he had made to signal the aliens flared across the sky. He knew that someone would, eventually, come around to stop him, but he didn't know yet who it was. Sadly, he found out when he turned around - it was his new nemesis, Nathan Fillion, who said "Hello there old sport" as casual as he would if he were taking a morning stroll through the park. The Doctor only grunted. "A little grumpy today, eh?", Nathan continued; he had been around this Doctor for so long that he knew he wasn't even remotely dangerous. Dr. Horrible didn't want to be the one who asked the inevitable question, but it would be better than the alternative - listening to another one of Nathan's rants would completely devastate him. He might even try to kill himself again. "Why are you here?" Nathan turned around to face Dr. Horrible. "Can't you imagine why? I thought you were supposed to be a genius..." He let the hurtful words hang in the air while Dr. Horrible tried to piece it all together. They stood there for what might've been five minutes. After a while, Dr. Horrible gasped, finally understanding the situation. He was baffled. Then he spoke; "You set this whole thing up." Nathan only smiled. "Ever since that tweet, all your movements, all the times you've beaten me, destroyed my plans, they've all been so that I would come up with this plan. So that I could create the best, most epic-est double rainbow to signal the alien hordes." In the five minutes Dr. Horrible had thought about this, it had all made sense. Now, however, nothing did. "But why?", he asked, not really expecting an answer. But Nathan turned around, grinning now. "Because I'm the Master." Dr. Horrible thought that, well, this was weird. "Like in Doctor Who?", he asked, stupidly. Nathan grew angrier now. "No you moron, not in Doctor Who. Like, THEIR master." But Dr. Horrible still didn't understand. "Who's master?" Nathan sighed. "You never were bright, were you?" He pointed up at the sky. "THEIR master. I'm the ALIEN master. I'm here to call them in, when the time came. And the time is now." Dr. Horrible, slow as he was, having reached the age of 50, asked the only question left; "But I don't understand. Why now?" Nathan grew tired of this now. I mean, how dumb can you really be? "Because this was the time it took for you to make the double rainbows!" Suddenly, after Nathan had given him this last piece of information, everything CLICK-ed for Dr. Horrible. "Aaah. So you've been manipulating me all along?" Nathan smiled. "Yes I have." "Alright then", said Dr. Horrible with a smile. He placed himself beside Nathan Fillion and waited for the aliens to destroy the Earth.

Nathan awoke at dawn. That's it, he thought to himself; no more DOUBLE RAINBOW-coffee before bed. Although it had been a smart story, he thought. I wonder what Joss could do with it...

2 hours later he was on the phone with Joss Whedon, who 5 minutes after they hung up had already begun writing DR. HORRIBLE'S UNIVERSE-WIDE SING-ALONG TELEVISION SHOW. It would, sadly, only run for 4 episodes before said aliens cancelled it. They didn't like their master-plan revealed as entertainment for Humans. We might've gotten ideas from it.