More on Serious Sam- Serious Sam The First Encounter

Serious Sam: The First Encounter is based in ancient Egypt and the story goes that the Earth is invaded by aliens under the command of Mental, the Sirians, in the 22nd Century. And Earth's greatest hero, Sam, is teleported from the 22nd Century to ancient times to try to defeat the Sirians and change the course of history.

Most of the game is about Sam fighting the monsters that Mental sent after him. But during his wandering in acient Egypt, he activates a hidden Sirian communication device that calls a starship from the depths of space.

Finally Sam goes to the Great Pyramid to encounter the ship but is intercepted by Mental's general, Ugh Zan III. After a great battle, Sam teleports himself onto the starship, and directs the ship to Sirius, there Mental is, to defeat Mental.

And this is the end to the first game- Serious Sam the First Encounter.

Note: there is only one boss in this game, that's Ugh Zan III.