Originally Posted by indesertum
i doubt most people have even heard of grodd
If you've seen any of a handful of the animated movies, comics, or spinoff/partner shows, you've seen grodd. And the people that watch those aren't just confined to nerds.
With that said, I think Flash is an absolutely terrible lone superhero for a movie. He is incredibly powerful (see JLU where he beats Brainiac), but doesn't have the character to fill up an entire video. Not compelling enough. Superman has the fame, Batman has the sheer intellect, etc. Flash is, in every version I've seen, a witty joke character, not well-suited for a headlining film.