Marvel Entertainment has released the official plot synopsis for Marvel's Agents of S.H.I.E.L.D.'s Season 2 premiere, "Shadows", which reveals that Marvel's Agent Carter star Hayley Atwell will guest star as Peggy Carter. Since her show is set in 1946, just after World War II, it's unclear how her character will be featured in "Shadows", but it will likely provide some sort of tie-in for Marvel's Agent Carter, which debuts in 2015. Take a look at the official plot rundown and the guest stars who will be showing up. In addition, Marvel has also released a new photo of Chloe Bennet as Skye in Season 2, which you can take a look at below.

Agents of Shield Photo 2

"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.

Marvel's Agents of S.H.I.E.L.D. stars Clark Gregg as Agent Phil Coulson, Ming-Na Wen as Agent Melinda May, Brett Dalton as Grant Ward, Chloe Bennet as Skye, Iain De Caestecker as Agent Leo Fitz, Elizabeth Henstridge as Agent Jemma Simmons and Nick Blood as Lance Hunter.

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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.

"Shadows" was written by Jed Whedon & Maurissa Tancharoen and directed by Vincent Misiano.

It's worth noting that Marvel's Agent Carter will air between the first and second halves of Marvel's Agents of S.H.I.E.L.D.'s second season, so it makes sense that Hayley Atwell will be showing up. Are you looking forward to "Shadows" even more with this huge lineup of guest stars? Chime in with your thoughts below.