I spent an entire day off in the scenario editor. I'm working on an epic scenario in which your prehistoric civilization faces an army of battlemechs from the future. Your primary goal is to destroy the enemy time machine, but you nearly have to wipe them out just to reach it. There are also several other enemies in your way, including another time traveller who is there only to look for relics.
In my most recent test play, there was a two hour naval battle between their UFO and my aircraft carrier and air force of WW-I and WW-II fighters.