I was thinking about an alien planet, with alien plantlife. Multiple mushrooms on another as trees, etc.
Which some human ship came to explore and there was this mountain filled with caves filled with aliens. The aliens could take a high route on the back side of their base through the snow covered mountains over a glacier(smal one) to the human base. But on the high route, you could fall through the ice and land in a underground freezing river which transported you to a hole in the cliff, where the waterfall would dump you down into the more fertile valley into a river that flowed to a lake.
The humans are can go trought the lower valley and canyons, they can take a ledge up the clif to the glacial trail near the alien mountain.
I also had this idea about a normal every day town/small city with houses and shops you could enter, sun shining, where everyone had been murdered and the aliens were in the sewer. And some human soldiers were going on pestcontrol.
Or a human cruiseship that had gone lost and a human militaryship docked with it and surprisingly the blacked out cruiseship was carrying aliens. The humans would be unattackable( forcefields, autoturrets) until the aliens managed to infiltrate the military ship and destroy some vital pice of equipment, main power reactor or something. After which the fight would become more even.
Or a refueling station on a dark, cold planet with bad red lighning and lava fissures, that had been wiped out by aliens and an human ship passing by expecting/needing refuelment. Send out a refuelment ship down filled with soldiers to infiltrate the dark looming facility and reactivate the refuelment apparatus. The humans had 30 minutes to do so or the mothership would run out of power and they'd be stranded anyway. The alien's base would be pretty unattackable. I also saw some action on large twisting fuelpipes above a giant pit.
That's some of my ideas, hope something usefull is in them.
[ This Message was edited by: M123 on 2001-11-26 04:05 ]