Oh, you're clever. I knew I would like you. It's 'Bgztl', by the way, with a less sibilant sound - but that's still the closest anyone's ever got.

You're pretty much right. The Legion of Superheroes is... a legion of superheroes! From all over the galaxy. Generally, the idea is one hero a planet, because most of the things people consider 'superpowers' are actually innate to the species. Bgztlians... go through things. Fancy that.