Demon - Mephisto - (悪魔 - メフィスト - Akuma - Mefisuto -) is the fourteenth episode of Ultraman Nexus.
- Ultraman Nexus Volume 4 features episodes 13-16.
- This episode, along with "Hero," was later featured in New Ultraman Retsuden episode 85 "Showdown of Destiny! Nexus vs. Dark Mephisto."