"Coulson is a big student of history and wants to return to those old ideals of Agent Carter's time," says executive producer Jed Whedon. "He's, like, 'Let's be the S.H.I.E.L.D. we were meant to be!' He wants to do the job right this time."Atwell, who will star in the 2015 spinoff series Marvel's Agent Carter, is joined in the flashback by Kenneth Choi and Neal McDonough, playing their Captain America characters Jim Morita and Dum Dum Dugan, respectively. No word yet if either actor has signed for the Agent Carter series.