Cairo

If you start reading here, you can and should bring the 2 girls on mars back home, you can read how to do that in chapter 5

ZAK:
Now we want to build the Skolarian drive.
To do so, you take the glowing object and put it on the socket, then the Candelabra on top of it, then the 3 Crystals on the Candelabra and voila, there is your new and improved Skolarian drive.

ANNIE:
Leave the Labyrinth of the Sphinx and enter the Pyramide. Here you should find Zak, who just beamed down from Mars. Now activate one switch of the scolarian drive with Annie to activate the Machine halfways.

ZAK:
With Zak you can now activate the last switch in this game to be used and the scolarian drive will be activated and the earth will be saved from the alien mindbenders and their evil plans.

so this is ...

THE END