Agents Of Shield season 4
Skye is now a fugitive after the events of Agents of S.H.I.E.L.D season 3 finale ABC

Agents of SHIELD season 4 is all set to introduce Robbie Reyes (Gabriel Luna) as the incarnation of the spirit of vengeance, Ghost Rider. Former SHIELD agent Skye, who has become a fugitive in the aftermath of events of season 3 finale, is now going by the name Daisy. She is set to meet the Ghost Rider.

In season 3 finale, Phil Coulson and his agents successfully defeated Hydra and Inhuman leader Hive. The fourth season of the Marvel series will be tougher for the agents as they are tasked to track down more enhanced people including the flame-licked spirit.

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Show's executive producers Jed Whedon and Maurissa Tancharoen, meanwhile have teased weak moments ahead for Daisy as she feels responsible for Lincoln Campbell's death in the season 3 finale.

"She[Daisy] now has a fear that everybody she gets close to something bad happens to them. Her self-imposed exile is based both on a need to not have those rules that the Sokovia Accords are hanging over her head, so she can honor Lincoln's belief in her, but also a desire to distance herself from people that she's afraid will get hurt or she will hurt," Whedon told Entertainment Weekly.

"She doesn't have any attachments and she may believe that she has nothing to lose," added Tancharoen.

The official synopsis of the premiere episode reads:

In the aftermath of their journey to another planet, Director Phil Coulson and the rest of the team were driven more than ever to put an end to the Hydra organization. Little did they know that they were up against the deadliest threat they've ever faced - an extremely powerful Inhuman, Hive, who was transported back from Maveth in the body of their worst enemy, Grant Ward. The team was able to thwart and kill Hive and take down Hydra, but they are all still mourning the death of fellow agent and Inhuman Lincoln Campbell.

In light of the Sokovia Accords, and with Hydra obliterated, S.H.I.E.L.D. has been legitimatized again and no longer needs to operate in the shadows. Since the world presumes that Coulson is dead, the organization needed a new Director to be the face of the organization. Coulson finds himself back in the role as an agent and teamed with Mack, and together they are tasked with tracking down and confirming the presence of Enhanced people, aka Inhumans. Agent May is tasked with training specialist strike teams, and Fitz and Simmons have taken a big step forward in their relationship.

Agents of SHIELD season 4 premiere episode, titled The Ghost, will air on 20 September at 9pm EST on ABC.