Premiere Tuesday has a lot going on (why couldn't some of it get pushed to shockingly dull premiere Wednesday?!) but there's nothing bigger than the premiere of the fall's highest-awareness drama. Marvel's Agents of S.H.I.E.L.D. is finally here, and the expectations will be high now that two new broadcast dramas have already premiered very well. Unlike those, SHIELD has to self-start, but with the Marvel brand on its side, that shouldn't be a problem. The biggest obstacle to stratospheric numbers may be the competition, which includes The Voice and an NCIS premiere.