A.I.M.

The Cosmic Cubes are powerful objects which stores reality altering energy. The Cosmic Cubes are able to rewrite reality and do virtually anything it's master wishes. It's master is able to create planets, augment or negate other people's powers and skill and so on. The Cosmic Cubes are created by the "Beyonders" from the unknown dimension of Beyond. The Beyonders made the Cosmic Cubes in order to test people's desire and evolution processes. The Beyonders also desired change in the omniuniverse.

The Cosmic Cube could only be obtained by projecting a particular type of energy which would open a rift to the source of the Cosmic Cube's power. The cosmic energy would flow through the rift and then stored in a matrix.

Skrulls

The Skrull scientists obtained a Cosmic Cube. The Cosmic Cube then developed sentient life and called itself the Shaper Of Worlds . The Skrull emperor wanted to rule as God king and used the Shaper of Worlds to do so. The Shaper of Worlds betrayed the Skrull emperor and seized a large part of the kingdom.

Cosmic Cubes on Earth

The Cosmic Cube was first discovered by A.I.M. in an experiment with an energy called "X element". The A.I.M. wanted to study of the strange energy which mutated George Tarleton into the powerful MODOK. The energy was so powerful that it was able to drive MODOK mad. The Red Skull wanted to steal the Cosmic Cube and succeeded in doing so. Despite the Cube's omnipotent powers, the Red Skull easily overpowered Captain America but later loses the Cube as the Red Skull was too confident. However, the Cosmic Cube altered reality which caused an entire island to sink and was then believed to be lost forever.

A fisherman discovered the lost Cube and transformed his village into a rich place. The Red Skull finds out about the lost Cube and sends his allies to obtain it for him. The Red Skull takes back the Cube and tries to confront Captain America again. However, the Skull loses the Cube to A.I.M. and MODOK and the Cube is apparently dissolved.

Retriving the Cube

MODOK eventually retrieved the Cube but lost it to Thanos the mad Titan who used the energy of the Cosmic Cube to win Death's heart. Thanos, realizing the Cube's tremendous power, uses it to confront the Avengers and Captain Marvel. Before losing the Cube, Thanos absorbed the Cube's energy and becomes virtually omnipotent. Thanos then realized that he now has no need of the Cube and abandoned the Cube's energy. The Cube's energy is reabsorbed into the Cube once again and Captain Marvel uses the Cube to return everything back to normal but instead burns out all of the energy stored in the Cube.

The Cube is then confiscated by Project: Pegasus for research. The Cube then began to regain it's reality altering powers and paid a huge role in the development of Aquarian. A.I.M tried to retake the Cube but is stopped by Captain America. As the Cube was reshaping reality, the Cube then developed sentient life and named itself Kubik .

Molecule Man and the Beyonder

Molecule Manaccidentally opened a rift through the atomic machine and traveled to the source of the Cosmic Cubes power. However, the cosmic forces which went through the rift hadn't been stored in a matrix which allowed the birth of the Beyonder .

Other Cosmic Cubes

The Red Skull was still obsessed of the Cube's powers and created imbalance Cosmic Cubes. The imbalance Cubes were taken by Korvac and later the Grandmaster. The other Cube was seemingly rendered useless.

Ultimate Universe

In the Ultimate Universe the Cosmic Cube fell from the sky above the home planet of Thanos, crash landing at his feet.  With the power of the Cube, Thanos would attempt to control all of creation.  Thanos was narrowly defeated, and at an incredible cost of lives.  Later in history the Fantastic Four would encounter Thanos in his home dimension after meeting the Seed Nineteen.  The Four escaped Thanos, but unknown to the team Thanos had siezed this opportunity by planting the idea for the Cube's design in the one person capable of creating one: Reed Richards.  Reed realized the spectacular power that the Cube could generate, and was fixated on creating one.  In his first attempt to harness the kind of power needed to create the Cube Reed locked onto what he thought was a distant star, and summoned the Silver Surfer to Earth.  Seeing the unhappiness and suffering of the Earth's residents the Surfer summoned his master the Psycho Man.

When Reed finally succeeded in creating a Cosmic Cube he caught Thanos's attention.  Reed attempted to use the power of the cube to protect New York City and the entire city was lifted out of the Earth to Thanos's dimension.  Thanos's power was far greater than Reed's, and even though Reed had the Cosmic Cube he was inexperienced in its use and unable to defeat Thanos.  Reed was seemingly killed by Thanos, but actually changed himself into an energy being to escape obliteration.  Ben Grimm, with the help of Thanos's daughter, was able to bring Reed back out of the shell he had created for himself.  They traveled back to Earth where Thanos had already enslaved many of Earth's most powerful heroes.  They were able to distract Thanos long enough for Reed to give himself back his body.  In order to defeat Thanos, Reed would unlock a small portion of the Cube's power which he had previously blocked off.  With this safeguard gone, Thanos's body quickly died and disintegrated.  Thanos's own infatuation with Death would be his undoing.  His desire to be dead overcame him and killed him.  In trying to decide what he would do with the all-powerful Cosmic Cube he would fulfill the ancient legend of how Thanos originally came to find the Cube.  Reed opened a very small rift in space and time.  He dropped the Cube through the rift above Thanos's planet, which plummeted to the ground and landed by a younger Thanos.  In this paradoxical move, the Cosmic Cube which Reed developed would be the original Cube that Thanos had discovered and nearly destroyed the universe with so long ago.