Cerberus (Mass Effect)

Cerberus is a human supremacist group. The organisation served as a minor villain in Mass Effect, an ally in Mass Effect 2 and a major villain in Mass Effect 3. The organisation is headed by the Illusive Man.

History
According to Admiral Kahoku, Cerberus has started as a Systems Alliance Black Ops, having complete access to Alliance activities. However, they have gone rogue to the point of conducting unethical experiments. Shepard can disrupt their operations and may discover Cerberus may be indirectly involved in some side missions.

In Mass Effect 2, Cerberus uses its resources to fund the Lazarus Project to bring Commander Shepard back to life after he/she was killed by the Collectors. The project was headed by Miranda Lawson, Cerberus' top operative. Once Shepard was revived, the Illusive Man explains that the reason Cerberus brought him/her back to life was that human colonies have been disappearing. The Citadel Council refuses to take action but Cerberus is the only organisation willing to take action. During the game Shepard can discover more unethical experiments done by Cerberus, such as their research on Pragia and Project Overlord.

In Mass Effect 3, Cerberus attempts to control the Reapers for humanity's use. The organisation has fully gone far to use Reaper technology to create soldiers loyal to the organisation. The organisation was first sighted on Mars, looking for the data of a Prothean superweapon. Commander Shepard was able to stop them and acquired the data on the weapon. Throughout the game, Cerberus attempts to undermine Alliance operations and Commander Shepard's mission to the unite the Galaxy against the Reapers. Eventually an attack was launched on the Cerberus Headquarters by the Alliance, dealing a massive blow to the organisation.