This is my version of Jack and the Beanstalk. Jack lives on another planet in the future. Humans have began colonizing and stripping other plantes of their resources. This particular planet was mined for a bright yellow gem. Jack and his mother live in one of these massive abandoned mining pits, where a whole shanty city has built up of "unwanted" people. All of the homeless people find their way into this civilization because they are persecuted on the surface.

The first piece is the scene when the "magic" beans grow out of the mildly radiated soil.
The next piece is one idea for the giant. He is a mercenary alien creature that travels from city to city, planet to planet, taking over the richest families house and using all thier money and resources. when those run out he finds a new house to take over.
The last piece is the giants weapon.

These still need a little work, but they are almost there I think.