Feh. It's just another cheesy old TV show that really does not need to be made into a movie, so it probably will be. And that theme song has either a) gotta go completely, or b) be stuck in the movie somewhere strictly as a gag in one scene and nothing more. Plus, let's be honest here...a GAH movie doesn't have a real good chance of being a success here in the U.S. based on the show itself; its name will damn it right off the bat overseas.
Still...in the right screenwriter's hands, it might make for a damn funny spoof of comic-book movies considering how prominent a trend they are lately. My approach would be to set it up kind of like a Green Lantern parody, where the aliens represent an intergalactic police force and the Milky Way needs a new officer to defend it, so they send this probe to Earth to find a suitable subject and imbue them with the power somehow, probably with a nanite beam that forms a telepathically-activated, crimson-colored 'exo-suit'. But both the probe AND the data module that shows how to use the powers are accidentally destroyed by the doofus kid who just got them, Ralph Hinkley (and no offense toward Katt's version of the character, but the Harpo Marx 'do has ALSO gotta go
).
So he basically has to fly by the seat of his pants when he's trying to use his powers to help people: imagine him rescuing the obligatory hot-girl-next-door from bad guys, and as she's holding on to him in this touching, tender moment that evokes the first Superman movie...he asks her if she can swim. She says, 'Uh, yeah, why do you ask?' At which point he drops her in a nearby swimming pool and calls to her as he leaves, 'I haven't figure out how to land yet. Sorry!'
And he NEEDS a superhero name, or at the very least a title of some kind. Given the GL parody approach, I'd call him something like 'quantum patrolman'...that's
quantum patrolman...qp. Stylize those two letters a bit more and you might have something that looks, well, a little bit like the actual GAH logo.
Then throw some supervillains into the mix for a change, add the cameo by Robert Culp and hopefully the movie won't be a complete and utter disaster..just a disaster.