In the fictional Star Trek universe, Remus is the sister planet of Romulus, located in the Romulus system. The planet was introduced in the first episode to feature the Romulans, Balance of Terror, but its inhabitants were not revealed until over thirty years later, in the movie Star Trek: Nemesis.
The planet's natives are the Remans, who were subjugated ever since the Romulans staked claim and set up their new homeworld in the system. Because the planet does not revolve and the species is in constant darkness, the Remans are extremely sensitive to light.
The Remans were treated as second class citizens within the Romulan Star Empire. Remus is the prime planet of dilithium mining and as such many Remans are forced into slave labour.
Much about Remus remains a mystery, but hopes of a more co-operative future between The United Federation of Planets and the Romulan Star Empire have been strengthened since Shinzon's fall.
Remus in the Star Fleet Universe
In the alternate Star Fleet Universe, Remus is a more naturally inhabitable planet in a neighbouring star system to Romulus, populated by Romulans (no distinct Reman sentient species seems to exist). During the General War, during Operation Remus, launched by the Alliance in Y181, the Reman system defences and military installations were destroyed by a raiding Alliance fleet, but the disastrous crash of the Federation capital ship MacArthur onto the capital city on the planet resulted in its nuclear reactors detonating and causing planet-wide devastation, reducing Remus to a state of nuclear winter for three years. Incensed Reman officers on board persuing Romulan ships ferociously attacked the retreating Alliance ships, nearly annihilating them.
StarTrek: Nemesis is the tenth film in the StarTrek franchise and the fourth for the crew of the Next Generation.
After presiding the long-awaited wedding for his first officer William Riker (Jonathan Frakes, StarTrek: Insurrection, Trekkies) and ship counselor Deanna Troi (Marina Sirtis, Heist, Paradise Lost), the crew of the Enterprise is called to the edge of the Romulan Neutral Zone.
StarTrek always has used futuristic issues to mirror today's moral dilemmas, and Nemesis plays on duality and the issue of nature vs. nurture.