Now what you didn't know was that Dr Zachary Smith came from about a century
in the future and had travelled with a spacefaring family of pioneers
called the Robinsons.
It seemed their ship had wandered off again and Dr Smith had found
himself getting pulled through a space anomaly that had dumped him off on Earth,but a century in his past.
Now what had happened was that in the year 2117 a group of sentient hostile snake-aliens had approached the ship in a craft far more advanced then the one the Earthly spacemen and girls had.
They'd beamed a genetic sample aboard,there'd been a misunderstanding and Dr Zachary Smith had found himself dumped
in 2016 Earth,with that alien snake genetic sample.
That and with the knowledge that his companions had just touched off a war
between Earth and the alien snake planet.
So he'd just given you that alien snake genetic sample.
So you were now a alien snake,even if you didn't know it yet.
At the very least Dr Smith was hoping that you've start laying eggs/live birth/whatever so that when the
alien snake warships cames to Eath a century from now there'd
be enough 'Earthling'alien snakes around to stop the War Between the Worlds before
it started.
He was also hoping that your superior alien snake mind had the smarts to help him get back to
his own time or at least help him build a spaceship a little more advanced
then the rocket powered antiques 2016 Earth was producing.