Koichi Sakamoto is a Japanese film and television director, stunt performer and coordinator, fight choreographer and producer. He is best known for his work in the tokusatsu genre, particularly for the Power Rangers, Super Sentai and Kamen Rider franchises.

Guyver: Dark Hero is a 1994 American tokusatsu superhero film based on the manga and anime, Bio Booster Armor Guyver. It is a sequel to the 1991 film The Guyver. Written by Nathan Long and directed by Steve Wang, the film stars David Hayter in the title role, replacing Jack Armstrong.