Hayley Atwell Guest Starring as Agent Carter in Marvel's Agents of S.H.I.E.L.D. Season 2 Premiere

Marvel has released the official description for the Season 2 premiere of Agents of S.H.I.E.L.D. and it contains the interesting nugget of information that Hayley Atwell will guest star as Agent Peggy Carter in the episode.

""Shadows' - Coulson and his team are now wanted fugitives with limited resources--but that's not stopping them from keeping the world safe from powerful and unseen threats everywhere. However, with new members they hardly know, will S.H.I.E.L.D. ever be trusted again? Watch "Marvel's Agents of S.H.I.E.L.D.," on the ABC Television Network.

Guest starring are B.J. Britt as Agent Antoine Triplett, Nick Blood as Agent Lance Hunter, Adrian Pasdar as Brigadier General Glenn Talbot, Henry Simmons as Alphonso "Mack" Mackenzie, Patton Oswalt as Agent Billy Koenig, Lucy Lawless as Isabelle "Izzy" Hartley, Wilmer Calderon as Idaho, Reed Diamond as Daniel Whitehall, Hayley Atwell as Peggy Carter, Brian Patrick Wade as Carl Creel, Matthew Glave as Roger Browning, Simon Kassianides as Sunil Bakshi, George Stephanopoulos as self, Raquel Gardner as Carla Talbot, Ben Turner Nixon as Hydra Officer, Franco Vega as Military Leader, Rich Ceraulo as Soldier #1, and JB Tadena as Private Tilden."

It seems almost certain that Agent Carter would appear in a flashback sequence, unless time travel has become part of this series. Either way, it makes sense to feature the character on the show, as she will get her own series in just a few months.

How and why do you think Atwell appears as Agent Carter on Agents of S.H.I.E.L.D.? Let us know in the comments section.