Burnham and Adira visit the Trill homeworld while Saru's efforts on the Discovery to help the crew reconnect yield surprises.

After receiving a message from Book, Burnham and Georgiou embark on a rogue mission to find him, leaving Saru to pick up the pieces with Admiral Vance. Meanwhile, Stamets forms an unexpected bond with Adira.

Discovery ventures to the Verubin Nebula, where Burnham, Saru, and Culber make a shocking realization about the origin of the Burn. The rest of the crew faces an unexpected threat.

As the Emerald Chain tightens its grip and the mystery of the Burn is finally solved, Burnham and the crew have one last chance to save themselves - and the Federation.

After months spent reconnecting the Federation with distant worlds, Captain Michael Burnham and the crew of the U.S.S. Discovery are sent to assist a damaged space station – a seemingly routine mission that reveals the existence of a terrifying new threat.

Saru returns to help the U.S.S. Discovery uncover the mystery of an unusually destructive new force. As Burnham leads the crew, she must also find a way to help Book cope with an unimaginable loss.

Burnham and Tilly hunt the killer of a Starfleet officer as Stamets and the science team race against the clock to prevent the anomaly from killing anyone else.

Tilly and Adira lead a team of Starfleet Academy cadets on a training mission that takes a dangerous turn. Meanwhile, Burnham is pulled into tense negotiations on Ni’Var.

Seeking answers, the U.S.S. Discovery ventures into a subspace rift created by the Dark Matter Anomaly. Meanwhile, Book faces a strange visitor from his past.

Tensions rise as representatives from across the galaxy gather to confront the threat of the Dark Matter Anomaly. Zora's new sentience raises difficult questions.

On Trill, Captain Burnham, Book, and Culber must pass a dangerous test to prove themselves worthy of the next clue. Adira reconnects with Gray and Saru’s first day as ambassador is complicated by his engagement to T'Rina.