So, what can we infer about supers in the world inhabited by Dr. Horrible?
We get mentions of Conflict Diamond, Hourglass and Bait and Switch, besides appearances of Dr. Horrible himself and Moist. We see Pink Pummeler and Purple Pimp (so identified in the credits). Then there's the Evil League of Evil: Professor Normal, Fake Thomas Jefferson, Tie-Die, Dead Bowie, Fury Leika, Snake Bite, and the Thoroughbred of Sin himself, Bad Horse.
The only hero mentioned is Captain Hammer. Does he have help? Obviously his ego is large enough to be the only one.
Do they have powers? Apparently some of them do, to judge by Moist.
What have I missed?