Last year's San Diego Comic-Con exclusive G.I. Joe / Transfomers crossover Starscream / Sky Striker combined two of Hasbro's most iconic brands into an amazingly cool toy. Despite hinting that they wouldn't pair the two brands together again, Hasbro realized they hit fanboy pay dirt when the Decpticon deco'ed jet quickly sold out. Now, their second SDCC exclusive crossover, the Shockwave H.I.S.S. Tank (also sold out) has been added to our photo gallery. Any takers on if they'll do it again next year?