Set roughly ten years before the events of the original Star Trek, the series follows the crew of the USS Discovery as they discover new worlds and civilizations, while exploring the franchise's signature contemporary themes. The season-long story line revolves around an incident and an event in Star Trek history that's been talked about but never been explored.
The crew of the U.S.S. Discovery joins forces with Captain Pike to unravel the mystery of seven mysterious red signals that have appeared across the universe.
A new signal appears, prompting Stamets' emotional return to the mycelial network and leading Burnham, Pike and Owosekun to a pre-warp planet, where they face a complex ethical dilemma. Tilly's overeagerness lands her in trouble but when the planet - and Discovery's landing party - are threatened, her curiosity may be the one thing that can save them.
A surprise visitor to the U.S.S. Discovery brings shocking news about Spock and dredges up past regrets for Burnham. Following the asteroid incident, Tilly struggles to keep a grip on her reality. L'Rell's authority on Qo'noS is threatened.
A mysterious sphere threatens the U.S.S. Discovery even as May, in her original form, implements a plan that puts Tilly’s life in danger. Saru and Burnham’s bond grows when Saru is forced to acknowledge a deeply unsettling Kelpien truth. Pike receives new intel on Spock from a loyal friend.
Burnham and the crew navigate a dangerous alien landscape in a race against time to save Tilly's life, but Stamets is not at all prepared for what they find in the process. Section 31 is assigned to help track down Spock, much to Pike's dismay.
When a new signal appears over Saru's home planet, Burnham, Saru and the crew embark on a perilous mission that puts Saru in danger and raises questions about the Red Angel's intentions. Hugh struggles to come to terms with his new reality.
Burnham goes to Vulcan in search of Spock, where she unearths surprising family secrets. In researching what is left of the Red Angel's signal over Kaminar, Pike and Tyler end up in battle with time itself. Georgiou has a few tricks up her sleeve for Leland and Section 31.
Spock and Burnham head to Talos IV, where the process of healing Spock forces the siblings to confront their troubled past. Stamets desperately tries to reconnect with Hugh, while Tyler struggles to shed the crew's suspicions of him due to his past as Voq.
When the Discovery crew infiltrates Section 31's headquarters, suspicions arise that the crew may have a traitor in their midst. Burnham tries to help Spock but her efforts don't go as planned.
Commander Michael Burnham of the Federation starship U.S.S. Shenzhou disputes her captain's peaceful stance when their ship encounters hostile forces.
Escaping from the brig while the ship is under attack, Burnham joins the captain in an audacious plan to end a battle rapidly escalating into war.
Michael's shuttle is intercepted by Captain Gabriel Lorca of the mysterious U.S.S. Discovery, who orders her to join a dangerous recovery mission.
Voq faces a powerful challenge in his pursuit of T'Kuvma's agenda, while Michael discovers a possible solution to the ship's propulsion difficulties.
When Lorca is kidnapped by the Klingons and imprisoned with an eccentric cell mate, the Discovery is assigned to rescue him despite Michael's doubts.
Michael uses her connection to Sarek to help locate him after he is wounded in an assassination attempt. Lorca deals with an unexpected visitor.
A figure familiar to Lorca and Lt. Tyler from the Klingon prison ship attacks the Discovery, intending to deliver the ship to their former captors.
The U.S.S. Discovery is tasked with a high priority mission to planet Pahvo and learn the science behind the Klingon's cloaking technology.
Bypassing Starfleet's orders, Lorca uses the U.S.S. Discovery crew's ultimate asset, the ship itself, in an effort to end the war with the Klingons once and for all.
While in unfamiliar territory, the U.S.S. Discovery crew is forced to get creative in their next efforts to survive opposing and unprecedented forces and return home.
The crew continues their guise, and Burnham is ordered on a merciless mission to end the resistance in hopes of returning home. Meanwhile, Tilly works on restoring Stamets’ neurofunction.
Burnham heads to the ISS Charon with a special "gift" for the Emperor. With the help of an unexpected source, Stamets gains clarity while trapped inside the mycelial network. Saru asks for L'Rell's help.
Lorca plans to move forward with a coup against the Emperor, propelling Burnham to make a quick decision to save not only herself, but the U.S.S. Discovery.
Burnham and the U.S.S. Discovery crew are faced with the harsh reality of the war during their absence. In order to move forward, Starfleet must use unconventional tactics and sources to take their next action against the Klingons.