With tensions and stakes high as Starfleet continues in their efforts to end the war with Klingons, Burnham begins to settle in to her new position aboard the U.S.S. Discovery.

Lorca unexpectedly finds himself in the company of a prisoner of war, Starfleet Lieutenant Ash Tyler, and a notorious intergalactic criminal, Harry Mudd. Meanwhile, Burnham voices her concerns about the repercussions of the spore drive jumps on “Ripper.”

The U.S.S. Discovery crew is intrigued by new addition, Lt. Ash Tyler. Sarek seeks Burnham's help, rekindling memories from her past. Admiral Cornwell questions Lorca's tactics.

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.

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.

With Georgiou at the helm of the plan to end the Klingon war once and for all, the U.S.S. Discovery crew struggles to fathom and tolerate her hostile tactics. Memories of past hardships are rekindled within Burnham.

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 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.

Burnham is stunned when she learns her ties to Section 31 run deeper than she ever fathomed. Armed with the identity of the Red Angel, the U.S.S. Discovery goes to work on its most critical mission to date.

When the U.S.S. Discovery's crucial mission does not go according to plan, Burnham realizes what must ultimately be done. The crew prepares for the battle of a lifetime as Leland's Control ships get closer.

The U.S.S. Discovery battles against Control in a fight not only for their lives but for the future, with a little help from some unexpected friends. Spock and Burnham discern vital new connections between the red signals while Burnham faces one of life’s harshest truths: the right decisions are often the hardest to make.