Lyric discussion by jolietjakemcfly 

Cover art for Everything You Ever lyrics by Dr. Horrible's Sing Along Blog

I LOVE the ending. There are talks of a sequel, but I like the story as is.

In the beginning we see Billy playing dress-up and trying to be evil, though he’s in general a pretty nice guy (“besides, there’re kids in that park”) and madly in love with Penny, the embodiment of good, but as the story progresses, and Penny falls for Captain Hammer, we see him get a little bit more evil until he’s hell-bent on killing him.

This final montage shows the death of Billy and the rise of Dr. Horrible. With the one good thing in his life now gone, and by his doing, we see that he’s no longer the kid playing dress-up but IS now Dr. Horrible (the way Batman is the real person and Bruce Wayne is the mask). His adversary is defeated, he rules with an iron fist, and is now in the ELE, but he’s not content. He becomes a tragic figure who you pity more than anything, like Mr. Freeze.

My Opinion

I think that Billy is a good guy, and he never becomes evil. He's just blinded by rage because Captain Hammer was such a jerk to the woman that Billy loved. When Penny dies, he becomes Dr. Horrible and is viewed as truly evil, but he realizes that he doesn't want to be Dr. Horrible.