Jetpack was a computer game for the ZX Spectrum where you had to guide a spaceman round an alien planet picking up pieces of his spaceship and assembling them.
Sounds pretty simple until you throw in a few scary looking aliens that don't like spacemen.
I remember playing this a lot when I was home from school one day whilst I was ill. I also remember watching Never Say Never Again on the telly that day. Mmmmm - sick days were great back then!