The Legion of Nothing 1: Rebirth

If you are looking for other Superhero web serials, Legion of Nothing by Jim Zoeteway is right up there with Worm and Super Powereds in terms of quality. It's still ongoing, and has been for over 12 years. He's got it separated into 10 books, but only the first 2 are self published. I'm not sure if they have audio.

Unlike Worm and Super Powereds, Legion of Nothing is more of a kitchen sink kind of super power universe. The others have a specific way powers work, but this one has everything from aliens to magic to alternate universes.