Neil Kaplan is the voice actor of Zarkon. He is known for his role as Optimus Prime from Transformers: Robots in Disguise, various roles in the Digimon franchise, and Madara Uchiha from Naruto.
Kaplan describes voicing Zarkon as voicing someone who is at ease, who does not fear for their life, doubt, or worry because they are at the top of a power structure. Hence, he does not voice Zarkon with any uneasiness to his voice or need to get loud very often.
- Kaplan has a dog named Buster P. L. Kaplan.