Professor Diaz is a Castle Heterodyne prisoner and a Spark, planted there by The Council to further the conspiracy to re-throne the Storm King. He has been working on a device to kill the Castle's multiple personalities by using carefully smuggled parts. He has a team of three prisoners working with him - they may have been Council plants: Dr. Mittelmind (a male Mad Social Scientist), Fräulein Snaug (Dr. Mittelmind's best minion), and Professor Mezzasalma (half man/half spider-clank).