Villain of the Week- Dr. Zin

Dr. Archimedes Zin (yes, he does have several first names, but I do like the Future Quest version best) is the only recurring villain from the original Jonny Quest series.  He is also an expert in the realm of science, and has some kind of agenda of his own.

Recently, he has been the big bad for a lot of the Quest stuff, which does make him a bit overused, though there is a small enough pool of movies and shows it isn't too bad.