The Morpho were brains with eyes on stalks who lived inside jars and used their telepathic abilities to manipulate the people of Morphoton into believing their city was luxurious and clean, when in actual fact it was a big ball of gross awfulness.

Podcast C005 The Keys of Marinus > > > > >

The Doctor & Co arrive on Marinus and are blackmailed by Arbitan to go on a suicide mission to retrieve the five titular micro-circuit keys.