Green Hornet #5 advanced the story and was its typical enjoyable writing coupled with gorgeous art. Its biggest issue is that it throws a lot of subplots out at once and then pays them off quite a few pages later. That gets irritating because you have to go back and remember where the subplot left off. That tends to happen when information is fired at you so rapidly that you can't take it all in.
That said, the storyline is still really interesting and it's always badass to see Kato and the Hornet fight. Definitely worth picking up.
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