Following last night's explosive Season 2 premiere of Marvel's Agents of S.H.I.E.L.D., ABC has released a new trailer for next week's episode, "Heavy Is the Head", airing Tuesday, September 30 at 8 PM ET.

In addition, we also have a new photo of Adrianne Palicki as Bobbi Morse, a.k.a. Mockingbird, plus an interview with Lucy Lawless, who played Agent Isabelle Hartley in last night's premiere. Be warned, if you didn't watch "Shadows" last night, there will be plenty of spoilers below, so read on at your own risk after checking out the trailer and photo below.

Agents of S.H.I.E.L.D. Adrianne Palicki Photo

Adrianne Palicki joined the cast last month as Mockingbird, after the character was teased at Comic-Con back in July. Entertainment Weekly reports that Bobbi Morse will make her first appearance on the show's October 21 episode, entitled "A Wolf in a Hen House." Fans won't get to see her transform into Mockingbird right away though, since she starts out as the head of Hydra security.

It isn't known how many episodes Adrianne Palicki has signed on for, or when we may see the transformation from Bobbi Morse to Mockingbird.

RELATED: How Does Agents of S.H.I.E.L.D. Tie Into Civil War?

Those who did see last night's episode "Shadows" were in for quite the shocking surprise, as Agent Isabelle Hartley, played by new cast member Lucy Lawless, was killed off. However, in a new interview with The Hollywood Reporter, Lucy Lawless reveals it's still possible she may come back.

"It's whatever the writers want to write. All things are possible in S.H.I.E.L.D.. That's what I love in this sci-fi comic world. There are no absolutes. There are no bottom lines. Every boundary is bendable."

Do you think Lucy Lawless should return to Marvel's Agents of S.H.I.E.L.D.? Is a "trip" to Tahiti in Isabelle Hartley's future? Chime in with your thoughts below.