Ty awoke suddenly when a flash of light lit up his room, accompanied by a sound that could only be described as "Vu-yoing!"
It was still the middle of the night, and thus his room was completely dark, but he could make out the shape of someone else fumbling around in some way. As he turned a bedside lamp on, he saw a girl around his age (maybe a year or two older), with long, light brown hair and freckles, some kind of high-tech-looking wrist device on one arm.
"Woooow", she said to herself, looking around in wonder before noticing Ty in his pyjamas in bed. "Uh... hello?"
"...Hi?" said Ty. "Who..."
"Hold on a sec..." the girl said, adjusting her wrist device. "Set this back to..."
Then she suddenly vanished again without a trace.
"Huh", said Ty. Well that was weird.
He pondered for a moment what to do next