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

Ayesha Mansur Gonsalves, Chelah Horsdal, David Benjamin Tomlinson, Emily Coutts, Ian Alexander, Oded Fehr, Ronnie Rowe Jr., Sonja Sohn, Tara Rosling