Courage is not the absence of fear, but rather the judgement that something else is more important than fear.
Nighttime, London, 2006. Christmas Day, to be exact- there was ash falling from the sky and the world had changed forever. Everyone around them- all the people wrapped up in winter coats, all the people who'd just faced certain death- seemed perfectly happy, but that was because, Mickey thought, they didn't know. They didn't know how much danger they all were in, how much danger had passed them by, and that what was settling on the ground wasn't snow but substance from an alien spaceship. If they did that thing that kids did, and stuck out their tongues to taste the snow- they'd get a shock. The snow would be dust.
Mickey's world had changed forever long before today. He couldn't pinpoint the exact time and place -sometime in the year 2005, back when things had been saner. Maybe it had changed when a tiny, insignificant department store had blown up in 2005 London- or maybe it had changed with the words You're not invited. Maybe his driving his then girlfriend to see some strange bloke with a website had been the beginning of the end, or perhaps the short conversation that went Thanks. For what? Exactly. had been it.
Either way, it didn't matter now, because it looked like things had come full circle.
"Well," the Doctor said, as Rose grinned excitedly and looked around at them all, "we'd better be off. Lovely to see you all again." He clapped his hands together enthusiastically, and turned to Rose. Rose turned to Mickey, and smiled at him. "I'll see you sometime, alright? I'll be back for next Christmas, I swear." She hugged him and then let go of him, then gave Jackie a hug, and then stepped into the TARDIS with the Doctor.
Mickey ran forward and grabbed the door before it shut.
"Oi," he said helplessly. "I want to come with you."