In the Season 2 premiere of Star Trek: Discovery , "Brother," the crew of the USS Discovery, led by new Captain Christopher Pike, investigates seven mysterious red signals across the galaxy. The episode delves into Burnham's strained past with her foster brother, Spock, who has vanished, while also exploring themes of PTSD in the wake of the Klingon War. You can find detailed plot recaps and analyses on Memory Alpha and Vulture .