Didn't he already do a Worm/Heroes fic, or was that someone else?

 

Yeah. This is a direct crossover, combining the two worlds, though. That one just had Cauldron bridge the gap between the two universes. Also, Taylor has Sylar's power in this one.

 

As opposed to...Peter's, I think, in the other one?

 

There also is a completet Dresden/worm fic,
Where Harry and family make their way to the worm world and his daughter goes heroing with vista. Not as good as wasps and Wizards but pretty decent non the less.