The Dream Dimension is a location in the animated series The New Adventures of He-Man.
The Dream Dimension was a plane of existence where the unconscious mind traveled while a person was asleep. The members of the Inner Council of Primus spend most of their time in the Dream Dimension in order to concentrate on the creation of the planetery shield.
Flogg's Tech Mutants created a device called the Dream Explorer which allowed someone to enter the Dream Dimension directly. This created an opportunity for Skeletor, Quakke and BH to enter the Dream Dimension and attack the Inner Council directly.
Meanwhile, Alcon was tricked by his fellow Scientists of Primus to be the first human test subject in his own new invention, the Particle Trans-Alconitor. This device was created to de-materialize any object and then de-materialize it anywhere in space. But instead of being transported to moon Enos and back, Alcon ended up in the Dream Dimension instead and returned to Primus together with a Creature from the Dream Dimension.
After Master Sebrian learned that the Inner Council was under attack in the Dream Dimension. He-Man insisted that he should go into the Dream Dimension to face Skeletor. Working together, the four scientists quickly modified their machine so that only a He-Man's mind will enter the Dream Dimension rather than his whole body. He-Man managed to turn his dream into a nightmare for Skeletor and defeated him. On his return to the waking dimension, Alcon's creature friend from the Dream Dimension also reappeared.