HomePeople Biography and filmographyGreg Diefenbach Biography unavailable on TMDB. Movies (1)TV shows (3) Movies (1) Genghis Khan - Rider of the Apocalypse2004 · Additional Writing, Co-Producer TV shows (3) Nightmare Next Door2011 · Narrator (voice) Egypt's Golden Empire2001 · Supervising Producer Journey Into Amazonia1999 · Supervising Producer