Phantasy Star II

Phantasy Star II, known as Phantasy Star II: The End of the Lost Age in Japan, is the second title in the Phantasy Star series. Released in 1989 for the Sega Genesis in Japan, it was released in February of 1990 in North America, and in November of the same year in Europe. It is highly regarded as one of the Sega Genesis' best role-playing games. In 2002, it was re-released on the Game Boy Advance as part of Phantasy Star Collection, a compilation of the first three Phantasy Star games.

Story
The Algo star system, comprised of the planets Palma, Mota, and Dezo, was ruled by the cruel dictator Lassic. He was toppled by the heroic efforts of a young woman named Alis Landale and her companions. One thousand years later, the Algo system is experiencing a golden age due to a supercomputer named Mother Brain housed on Mota. Mother Brain completely terraformed Mota, transforming it from a desert planet into a temperate paradise like its sister planet, Palma. Mother Brain directs human agents to enforce the peace, and controls systems such as the Biosystems Lab, which genetically engineers plant and animal species for human use, and Climatrol, which regulates Mota's normally harsh climate to something more temperate.

However, recently there have been problems. The Biosystems Lab has begun to create hostile genetic aberrants instead of useful species, and rivers and lakes have been drying up. Desperately seeking answers, the Commander of Mota, a duly-appointed agent of the Mother Brain, assigns his most trusted agent, Rolf, to investigate.