Flash Gordon is the protagonist of a space adventure comic strip created and originally drawn by Alex Raymond. First published January 7, 1934, the strip was inspired by, and created to compete with, the already established Buck Rogers adventure strip.
Add filmmakers and cast the films/shows/franchises (or concepts) that they were rumored, considered, offered, negotiated, turned down, and/or partially contributed before departing. (Please double-check in research.)