I've recently come up with an idea for a mod which basically follows this story line:
CHAPTER 1: NO HANDS ON DECK
This begins with Mr.Man jumping off a plane (i'm thinking of an osprey for this bit) to investigate a mysterious distress call from a government vessel. As he climbs onto the ship it is deserted, with the exception of bloodstains. The player must search the vessel for any survivors. At the lower deck the player will find a submarine bay, and one remaining scientist, who informs the player about everything.
The background is that millions of years ago a Xen battleship crash-landed in the ocean and had remained undiscovered for several millenia until about 20 years ago when the US government located it and built a research base surrounding it.
And then 5 years ago people began to dissappear, until the scientist realised what had happened, the Xen creatres had re-animated and are hell-bent of killing anything they see.
CHAPTER 2: DEEP DEAD SEA
The scientist takes the player to the underwater research base and the player is then sent on several 'missions' that involve purging the base of alien scum.
After this the player will be sent into the Xen craft to try and find any survivors. they will find 2 to 3 survivor out of 93. And the Xen re-animation machine. The machine will consist of a stalk thingy, and several people sticking out at awkward angles. The plyer is then to assume that the aliens had been using the people to power up their alien army, with which they're going to take over the world.
The player is then given some variety of bomb to destroy the ship with, then must evacuate. Then they will discover that the surviviors have been killed. As they escape, they will find on the main deck a boss i have named Nemesis. This boss is a Gargantua that is jet black, 3times as tall, and has 6 arms, that nearly beats the
** out of the player untill a chopper will come over and kick its ass, and the player is rescued. END
Let me know if you are interested.