IDW Publishing announced at Comic-Con that it's expanding its digital-comics initiative to include the G.I. JOE: The Rise of Cobra prequels, as well as Transformers and CSI titles.

Over the coming weeks the company will add more G.I. Joe and Transformers comics, plus Danger Girl, Astro Boy, Groom Lake, John Sable Freelance and GrimJack.

The IDW catalog can be found on iTunes, where users can download an eight-page preview of Danger Girl #0 for free.