Morphoton

Morphoton was a city located on Marinus.

Morphoton was ruled by a group of disembodied brains that enslaved the populace by using Somnor Discs to create the mental illusion that the city was luxurious, when it was really a place of dirt and squalor. The brains were destroyed by Barbara Wright, thus freeing the inhabitants of Morphoton. (TV: The Keys of Marinus)

The Eleventh Doctor mentioned this city to Ian Chesterton and Barbara when he met them. (COMIC: Hunters of the Burning Stone)