The Almighty Tallest

The Almighty Tallest is an honorary and physical title given to the entity (or entities, if there's a tie) who are chosen by the control brains to run the Irken Empire. There are currently two leaders, Almighty Tallest Red and Almighty Tallest Purple. Red seems to be a bit more intelligent overall but the pair rule well in concert - rarely if ever disagreeing on the course of action which should be taken.

The previous Almighty Tallest was Miyuki who was killed when an infinite enerty absorbing beast designed by Zim escaped and ate an infinite energy generation machine - the beast rapidly grew out of control and ate Miyuki before disappearing into space.

Miyuki was succeeded by Almighty Tallest Spork. Unfortunately, shortly after gaining the power of the Tallest Spork was also eaten by Zim's creature.

The current Tallest are presently running Operation Impending Doom II from their flagship, the Massive. They seem to really like being complete dictators (quoth Purple - "Since we've become the Tallest...it's neat!") and there's no sign that they'll stop anytime soon.