In flashbacks to the previous year, it is revealed that Sam Koenig has been overseeing the secret Theta Protocol project, which involves refurbishing Nick Fury's disused helicarrier.

When she mentions to Gordon that she had a vision of a stone with the ability to become a liquid, he and Jiaying explain that this is the Monolith, a Kree weapon intended to eradicate the Inhumans.

She shatters the crystal, and the Terrigen mist petrifies Gonzales, after which she shoots herself with his gun, and tells Skye and the other Inhumans that he tried to kill her.

In March 2015, Marvel announced that the twentieth episode of the season would be titled "Scars", to be written by Rafe Judkins and Lauren LeFranc, with Bobby Roth directing.

[1] In March 2015, Marvel revealed that main cast members Clark Gregg, Ming-Na Wen, Brett Dalton, Chloe Bennet, Iain De Caestecker, Elizabeth Henstridge, Nick Blood, and Adrianne Palicki would star as Phil Coulson, Melinda May, Grant Ward, Skye, Leo Fitz, Jemma Simmons, Lance Hunter, and Bobbi Morse, respectively.

[1] It was also revealed that the guest cast for the episode would include Henry Simmons as Alphonso "Mack" Mackenzie, Ruth Negga as Raina, Patton Oswalt as Sam Koenig and Billy Koenig, Kyle MacLachlan as Cal, Edward James Olmos as Robert Gonzales, Jamie Harris as Gordon, Christine Adams as Agent Anne Weaver, Mark Allan Stewart as Agent Oliver, Maya Stojan as Kara Palamas / Agent 33, Dichen Lachman as Jiaying, Luke Mitchell as Lincoln Campbell, Alicia Vela-Bailey as Alisha Whitley, David Douglas as Michael and Crystal Coney as scientist.

Simmons, Negga, Oswalt, MacLachlan, Olmos, Harris, Adams, Stewart, Stojan, Lachman, and Mitchell reprise their roles from earlier in the series.

We're not getting blown up like we were last year with Hydra and Captain America, but some elements or some things from the movie do affect some of the relationships in our episodes moving forward, in an interesting and constructive manner.

The different artists were once again chosen to create the teaser posters, based on their previous work and how it connected to the themes and emotion of the intended episode.