Marvel's Agents of S.H.I.E.L.D. premiered Tuesday night on ABC. They also unveiled a companion web series that will explore the "mythology, lore and technical wizardry" that the TV show's agents face throughout the season.

Called Marvel's Agents of S.H.I.E.L.D.: Declassified, the behind-the-scenes series will be liveonline at,, the Watch ABC mobile app and

Created by Joss Whedon, Jed Whedon and Maurissa Tancharoen, the series stars Clark Gregg as Agent Phil Coulson, Ming-Na Wen as Agent Melinda May, Brett Dalton as Agent Grant Ward, Chloe Bennet as Skye, Iain De Caestecker as Agent Leo Fitz and Elizabeth Henstridge as Agent Jemma Simmons.