: Their relationship continues to deepen as Burnham supports Book through his emotional homecoming.

: Shows growth in her recovery from trauma by successfully piloting the ship through a manual combat maneuver.

: Burnham and the brothers use the Discovery's technology to amplify their empathic abilities, successfully redirecting a swarm of sea locusts back to their natural habitat.

: Displays increasing vulnerability as she experiences mysterious blackouts, leading her to reluctantly accept medical help from Dr. Culber. Production Details Director : Olatunde Osunsanmi. Original Air Date : December 3, 2020.

The episode follows Michael Burnham and Book as they travel to Kwejian after Book receives a distress signal from his brother, Kyheem. The planet is under threat from Osyraa, the leader of the Emerald Chain, who is retaliating against the planet for harboring a fugitive and failing to manage a sea locust plague that threatens their crops.

: The refugee Ryn reveals a critical vulnerability: the Emerald Chain is running out of dilithium, explaining Osyraa's desperate and aggressive tactics.

: The episode reveals that Book (real name Tareckx) has been estranged from his brother and home for fifteen years. The two must reconcile their differences and work together to save their people from Osyraa's wrath.