The Mule character was introduced in Isaac Asimov's Foundation series, first appearing in 'Foundation and Empire' published in 1945. He is a mutant with the ability to influence emotions and control others, dramatically altering the course of the Foundation's history.
The Mule's influence in the storyline significantly shifted the narrative of the Foundation series, presenting a unique form of antagonist with psychic powers rather than brute force.
Various adaptations of the Foundation series, including radio plays, comic adaptations, and planned television series, have featured The Mule as a central antagonist, highlighting his importance in the overarching story.
Apple TV+ announced the development of a Foundation television series which includes The Mule as a key character, bringing renewed attention and reinterpretation to the character in modern media.