Season 1
Dedra first appears in the fourth episode "Aldhani". She tries to gain authority over a Ferrix incident involving a Starpath unit because it was stolen from her sector. Her colleague, Supervisor Blevin, who oversees the Morlana sector, denies her authority over the incident. She suspects a rebel network is forming, but her colleagues and superiors doubt her claim due to the lack of evidence. Following the Aldhani heist, Dedra uses the Imperial Emergency Act to collect data from sectors outside her jurisdiction without official sanction. Major Lio Partagaz, leader of the ISB Board, reassigns the Morlana sector to Dedra after determining it has become a distraction for Blevin. Dedra interrogates Syril Karn after he submits six reports on Cassian Andor. Later, Dedra requests additional resources to hunt down Cassian Andor along with an individual code-named "Axis" whose real identity is Luthen Rael.
Dedra goes to Ferrix to a former hotel that has been converted into a garrison. There she interrogates Bix Caleen with the help of Doctor Gorst to identify Rael, whom Caleen is an acquaintance of. On her way to work the next day, Dedra is stopped by Karn. He thanks her, believing she is the reason he received a promotion. Dedra believes he is stalking her and threatens to have him imprisoned if he pursues it any further.
During a recorded speech by Maarva Andor for her funeral, Vanis Tigo, an Imperial captain, knocks down the droid B2EMO, which is broadcasting the speech. This angers the crowd and eventually causes a riot. Dedra is unprepared while trying to locate Andor. Dedra is attacked and thrown to the ground. While trying to retrieve her blaster, she is lifted up and taken into a warehouse by Karn. Dedra is stunned and tells Karn that she should thank him. Karn responds by saying there is no need to.
Season 2
At the start of the first episode of the second season, "One Year Later", Dedra attends a secret Imperial meeting at the Maltheen Divide. During the meeting, Director Orson Callan Krennic presents an Imperial plan to take over Ghorman to acquire kalkite. The mining process could render the planet unstable. The plan includes a propaganda campaign to damage Ghorman's reputation to avoid galactic sympathy and to justify military crackdowns. Dedra is unsatisfied with the plan and tells Krennic that they need to cause an insurgency.
Dedra plants her now partner, Syril Karn, to be put in charge of the Imperial Bureau of Standards Field office on Ghorman. Karn is contacted by the Ghorman Front, an anti-Imperial rebel group. Dedra uses Karn to give information about classified military shipments with the intention of giving the Ghorman Front access to more weapons to justify a stronger Imperial presence. Dedra goes to Ghorman herself to oversee the final stages of her operation. The Ghorman Front has now organised a crowd in Palmo Plaza. Imperial forces start to surround the Plaza. Karn, realising what is about to happen, confronts Dedra. Karn is frustrated with Dedra for not telling him the true reason for his placement at Ghorman. Dedra argues this would happen with or without them and that they will return home as heroes. Karn leaves and goes into the crowd in the Plaza. After an order from Dedra, an Imperial sniper shoots one of the control officers, killing the officer. This causes Imperial forces to open fire on the Ghor crowd. Dedra, unaware that Cassian Andor is trying to assassinate her, unsuccessfully tries to locate Karn. Following the massacre, Dedra has a breakdown, knowing Karn is likely dead. [14]
Dedra now returns to her search for Axis and is able to locate him because of classified files that were accidentally given to her office. From these files, Dedra is able to deduce that Axis is Luthen Rael. Dedra confronts him alone while having a team surrounding his gallery. Due to this mistake, Rael has time to attempt suicide. Rael is taken to hospital and later killed by his assistant Kleya Marki to prevent the Empire from gaining any further information. At the hospital, Dedra is arrested by her previous assistant, Avril Heert, who is now himself a Supervisor. The files Dedra had received contains not only a description of Rael, but also highly classified information relating to the Death Star. Dedra is confronted by Krennic in an ISB interrogation room. He reveals to Dedra that her colleague, Supervisor Lonni Jung, had logged into her files the day before and likely leaked them to the rebels. Dedra tries to defend herself by stating that she only acquired these files to find Axis. Krennic criticises Dedra for confronting Rael on her own, and states that if she is not a rebel spy, she missed her calling. Dedra, now in a cell, is approached by Supervisor Heert for advice on locating Marki. Dedra advises that they track her location through the use of fractal radio.
In one of the last scenes of the series finale "Jedha, Kyber, Erso", it is revealed that Dedra has been placed in a prison similar to the one Cassian Andor experienced in Season 1. [7]
