Grim Ripper, a 10 story tall monster hydra which looks like a serpent with nine heads, the head in the middle being the biggest head. If one head is cut of, 2 more heads grow in it's place.The middle head can't be cut of. He has super advanced technology, lots of spies, and a home base in North Korea. Some clarifications: He has to take over at least the Americas and Asia. He has to secretly manipulate the governments like a puppet master working behind the screens. He has to take over the world in 60 years. He's immortal, which means he's invulnerable and old age won't kill him. He can't join a secret society or world controlling position because then there would be proof that hydras exist. If so, how can Grim Ripper rise to power? Note: I'm not a hydra!!!
Revelations suggests that the hydra will do this by cornering global commerce.
Revelations 13:17: And that no man might buy or sell, save he that had the mark, or the name of the beast, or the number of his name
Revelations 13 in fact lays out the plan pretty well with minor differences as regards # of heads, # of months to accomplish the plan etc. Hydra healing powers are covered. I imagine the hydra must have financial software which is required to conduct all commerce. Also (13:15) people who do not worship the Beast will be killed. That helps the world domination piece.
Between cornering commerce and getting everyone to worship him (or maybe his friend beast) Revelations is about as well vetted a plan for a many headed monster to take over the earth as you are likely to find.