Mental Omega APYR is a Mod for Command & Conquer: Red Alert 2: Yuri's Revenge. The mod aims to significantly balance the game by adding new units to each faction and by balancing the already existing ones. The mod also comes with a brand new storyline and a campaign for all the three sides (Allies, Soviets, Yuri, known as Epsilon in the mod).
When news about Yuri, who had been trapped in the past by the Soviets after the final battle in Transylvania (from Head Games), arrived at the Psychic Corps' Command Center in Antarctica. His loyal followers quickly decided to prepare for the salvage operation, based on the Temporal Displacement device, which was built secretly by Albert Einstein during the previous war against Yuri's forces.
A New Plan is Born
The plan had succeeded and it was possible to move elite forces back in time and locate their master. Yuri was brought back to the year 1980, just a month after he was defeated in his fortress in Romania. To prevent another failure, Yuri decided to push his psychic powers to the limit and create a new weapon which would be much deadlier and more effective than those infamous Psychic Dominator devices.
Before bringing the device to life in the Antarctican base, which was hidden from the world due to his recently developed psychic illusion generators, he ordered his scientists to reconstruct sites of Psychic Dominators around the world, including establishments of such in the Soviet Union and United States.
Taking over Moscow
A Year later, on March the 18th, 1981. Yuri ambushed the Soviets with a quick, stealth-based assault on Moscow and deployed Psychic Dominator devices.
With the precaution of the enemy down, he easily took over almost every Soviet country in the WSA and seized Mind control through the United States with two Psychic Dominators - one deployed in Washington DC and another one in Fort Collins.
In the USA, he had sent his genetically-modified commando Rahn, who was created on the artificial Tibrena island located near the Easter Islands, in order to deal with the defenses in Fort Collins and to prepare the landing of the establishments of that device. The Psychic Dominator in Washington was secretly built underground, but Yuri was trying his best at the  Psychic Dominator in Moscow.
Disordered, the Soviets quickly mobilized themselves and commenced an evacuation from Moscow. They headed for the Ural Mountains base, where the first Battle Lab of the Soviet forces was created by Yuri before his betrayal (from Chrono Defense).
Preventing the PsiCorps' siege, the Soviets were able to contact its main army located in the United States and Europe, which had not fallen under the control of Psychic Dominators yet, with some targeted activities of enemy forces on other continents.
Yuri's Libyan Silos
Following the bad evacuations, they destroyed Yuri's main nuclear silo weapons in Libya and neutralizing the Washington DC Psychic Dominator for cooperation with the Allies by creating another mind control-free land - one of the very few, including China and Canada.
While this was happening, that 4-G base in the Ural Mountains was finally conquered and captured by the PsiCorps' forces, leaving the Soviet defenders brainwashed by the traitor. Yuri announces on Earth, that the creation of the Epsilon Army and his return, just after the destruction of his device in the capital of the USA had risen to war.
The Allied forces had finally ensured that it was the PsiCorps who stole the Time Machine over a year ago. After recapturing the United States, the paths of any Soviet and Allied armies had been divided. The Allies continued their war with the Epsilon, trying to limit Yuri's army to Moscow.
With authorization given by President Dugan and Albert Einstein to eliminate the stolen Time Machine (long thought to have been moved to another position - in fact, it was hidden by Yuri's psychic illusion generators).
By this time, the Allies made sure that Yuri will not be able to create another paradox by using the device in the event of his ultimate defeat. The stolen time machine was then destroyed by the Allied naval forces in the Caribbean as a Spy collected an important advice, after the Soviet and Allied call from their leaders.
Later, after collecting important information from spies in Skaramagas, they've managed to prevent a swarm of brainwashed Russian forces into assaulting Europe from the USSR to Iceland. It would also be possible to evacuate Albert Einstein from the Black Forest in Germany to Alaska, leaving Great Britain to be alone in Yuri's brain to invade as the last nation, left in Europe.
Einstein was then able to finish the reconstruction of the Chronosphere device, which was earlier destroyed in Germany by Soviet forces in order to prevent Chrono Storm (supposed to be the final way to abolish Soviet reign). The Allies decided to use the elements from the last RA2 mission against Epsilon army in Moscow.
Mind Controlling China (Red Alert)
Meanwhile, the Soviets managed to capture an abandoned Psychic Amplifier in China, which was supposed to be used by Yuri before the famous elimination of the Allies' Peacekeeper sites. This Psychic Amplifier would have granted the Soviets the possibility to crush Korea and strike the United States from the east, if it had been used before.
The long-forgotten device was restored to full functions, and so the Chinese empire fell under mind control of the Soviets. With projects and plans found in the Military Headquarters in Beijing, the incorporation of the Chinese airforce program into Soviet equipments were possible.
The Red Army eliminated Epsilon's Nuclear Silos located in China but so too able to finish the construction of a Chinese superweapon - the Centurion Siege Crawler. It was presumed that it would be the only way to ignore Yuri's mind control tactics and effectively lay siege to Moscow.
Attacking Yuri's Headquarters
Yuri's army was successfully pulled out from Europe, America, and eastern Asia. The army has been limited to its final base in the Soviet Union. By October the 22nd, 1981 is that the Allies launched a chrono infiltration on Moscow (the mission is a déjà vu of the last mission in RA2, due to the changes done with the Time Machine, except Yuri's army replaces the Soviet army).
While the Allied brigade was there, the Soviets started ruination of the Epsilon fortress at the same location, striking from the west with an MCV supported by a tank division and from the east, using the Centurion Siege Crawler and Chinese forces.
The Psychic Dominator located near the Kremlin was quickly destroyed, freeing all the remaining Soviet forces within the Soviet Union. With that accomplished, the army of Epsilon was finally crushed. The only problem was that Yuri had no longer been in the Kremlin.
Yuri's almost perfect plan was yet to be revealed, although due to some technical problems which he didn't expect, it was revealed much faster than it was supposed to. The machine which he built in Antarctica, named the Mental Omega device, was creating strong energy fields which interrupted functioning of the psychic illusion devices that will shroud the base.
Ironically, Psychic Interrupters had been interrupted, and so the Mental Omega tower was revealed to the Allies and Soviets but they planned an attack on Antarctica (from Brain Dead).
The two sides both commenced a full-scale invasion over Antarctica and destroyed the last of Yuri's Epsilon bases as well as the remains of Yuri's army, finishing what was known as the Mental Omega War or the third stage of the second Great War. Yuri himself was found dead in the ruins of the tower.
Mental Omega aims to make the game almost perfectly balanced (Hence why APYR = Almost Perfect Yuri's Revenge) by adding a lot of new units and rebalancing the already existing ones. Some notable additions include more naval units for Yuri, new country-specific units, the Centurion Siege Crawler for the Soviets, and other stuff.
Mental Omega also adds a lot of new game modes to the game, other than the three standards Battle, Free for All and Team Alliance. For a list of all the gamemodes available in the game, go here
The Mod also comes with many new multiplayer maps, as well as a new single player campaign for all the three factions. Co-op maps are also planned for future releases