One of the most powerful super hero comics I’ve read over the last few Booster Gold #5. Our time travelling hero goes back in time to the events of Alan Moore’s The Killing Joke, and no matter what Booster tries he can’t save Batgirl. So why is this a great story?
It’s because this is the moment where Booster Gold becomes a serious hero. He won’t accept failure and keeps going back in time to the moment where the Joker fires a crippling bullet through Batgirl’s spine. Ultimately Booster finds out that this event has to happen and that it’s an important part of the history of the universe. He must accept that there is nothing that he can do to fix this.
If you’ve read The Killing Joke, you know that the Joker taking pictures of the original event is an important part of the original story. A later issue of Booster Gold makes reference to his attempt to change history, as Batman (who has possession of the photos) reveals that he knows that Booster attempted to save Batgirl. Batman finally respects Booster.
Unfortunately, the events of Flashpoint and the New 52 rendered this all irrelevant, but its one hell of a story.