Yo so ok here we go. This guy is the leader of the Demons in Devilman TV version. He was in the Himalayas for years and send Deviman to cause damage to da urth to pave the way for a daemon invasion. When Devilman fell in love with Miki Makimura and ditched his mission, Zanin sent various demons after him each week to both get rid of da humans and beat Devilman.
In Episode 1 he ends Devilman, Rerasu and Daruni to slag the humans in the area, fight to the death, take their bodies and go f up da urth in the human body they killed. After Reijiro Fudo an Akira Fudo are killed, Devilman kills Rerasu and Daruni easily. Zanin gives him the info on Akiras life (how did he know it??) and sends him to spread chaos. Devilman falls for Miki and gets softer so He sends Henka to see wtf happened. After Henka nearly slags the Makimura's, Akira sides against the demons and thus begins the adventures of Devilman.
In here Dr. Hell and his hench-hermaphrodite Baron Ashura follow Sirene to the Himalaya Mountains, were the rest of the tribe is frozen. Hell helps to free some of the demons and holds em off with a raygun when they try to ice him. He makes a demon deal with Zanin to help them defeat their enemy, Devilman, if they will help him defeat Mazinger. He sends Bugo to deal with Koji Kabuto and other monters to face DM and MZ. They capture Devilman, crucify him and torture him(Just like with the Mel Gibson film about Good Friday but less holy) but Mazinger Z saves him and they team up to f butt. He gets cut in 2 across the aist by the Scrander and his halves fall to the earth. Pretty sre hes dead.