Demerzel is a fictional character in the 2021 Apple TV television series Foundation, an adaptation of the Foundation series of novels by Isaac Asimov. She is portrayed by Finnish actress Laura Birn. Demerzel is a gynoid, or female-presenting humanoid robot, who serves as the majordomo to the revolving trio of Emperor Cleon clones, Brothers Dawn, Day and Dusk. In season two, it is revealed that Demerzel is the real power behind the Imperial throne, guiding humanity on a millennial scale.