Well it was going to take a lot more then pixie dust to get rid of the evil in
Sarah's dragon soul.
This was a flame breathing western dragon after all.
However it just so happened that the towns resident crackpot inventor
Professor MacGee,had gotten over trying to make Model T Fords fly with
fluuper,and was currently working out the machinery and the physics
equations for time travel.
What MacGee had discovered was that to go into the past or future,you
needed to be holding not just something from that year,but something
that had been "fractalized" as the physicists put it,or
"magicked" as fairies might put it.
There weren't too many fractalized things lying around town.
All had seemed lost,but MacGee and his off again on again assistant
Biff the Football star had been marching closer to Sarah's ruined farm
with the Fractal-o-meter when the red light on top began blinking and the various needles began redlining.
Clearly they'd hit paydirt.
So in due course they came upon Sarah's egg and the Professor
solemnly announce the Fractal-o-meter
readings indicated it was a object originating from around the year
470 AD around the Northeast area of England.
Biff was pretty impressed with that deep knowledge until MacGee pointed
to the tag taped to the object with fairly delicate handwriting
stating the object was a dragon's egg from 470AD from Camelot,
ruling seat of Uther Pendragon.
So the two carried the surprisingly heavy dragons egg to the
Professor's mini-van and headed back into town with their
discovery.
Biff wasted no time telling his high school friends that he'd
helped the Professor find the key ingredient for MacGee's
machine,and soon a excited crowd of kids had
gathered around the Professors flying saucer shaped
conveyance,which could float and move about when fluuper was put
in its various Motivator engines.
They all were eager for a trip to King Arthurs Court.