For those interested in the graphic novels, a third compendium is coming in October, just in time for the new season.

 

If you haven't read them yet and are interested, I'd highly recommend them.

 

I'm not sure what specific graphic release is roughly comparable to the show's current timeline (especially since many of the storylines have changed,) but it's part way into the second compendium.  Each compendium covers 48 issues, and IMO they don't really spoil the show.  In fact, to me, the opposite is true.  I enjoy reading the original inspiration for the show, and to me the thrill is seeing how they translate, reshape, and retell the story on TV.

 

You can find the third compendium on pre-sale at Amazon.

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