I am looking for an old game I played on DOS/Win95 ages ago.
It's sci-fi setting, about human setting out to find a lost old starship and colonising space.
You have advisors, you can build on planets, asteroids and gas planets to get energy and ore (and more stuff) to build technics and robots. There was also research.
You were able to send scout planes to the planet.
The main plot was, that rather early in the game you had to destroy two(?) towers and then your colonies were attacked by green slimes/plants and you had to find a cure (which I usually failed at

Thanks for your help
Best regards
Found it...sorry for the troubles. The game is called Alien Legacy