Gatchaman is in the ‘sentai’ genre (which is about as close to American-style superheroes as Japan gets). Generally, they involve one or more heroes who transform into super-alter-egos, complete with skin-tight bodysuits and motorcycle helmets. The genre’s most famous example (around here, anyway) is Power Rangers.
Anime distributor Sentai Filmworks recently announced that the original Gatchaman series will be getting a Blu-ray release.
Here’s the trailer. Take note of the fact that the movie features a song by a band called ‘Bump of Chicken.’