Alien Legacy

Alien Legacy is a sci-fi strategy game published by Sierra On-Line in 1994.

The game includes elements of city construction, research, resource management, industrial production and combat. Players must colonize a star system light years from earth by building planetary cities and Space Stations. Several advisors guide the player through the plot and a PDA reminds the player of important tasks. Given sufficient player immersion, the game atmosphere may add to the experience of ensuring the survival of mankind. The game progresses in real-time but the game speed can be adjusted. Time is measured in turns, which can be quite confusing to some.

Some tasks must be done before a set time limit or else the game will end prematurely. For example, at the beginning of the game, if the player fails to form a self-sufficient colony on Gaea, (a colony with at least one habitat, power plant and factory) the science advisor will kill the player for incompetence and take over the command.