Light and Shadows

Discovery is confronted by a time anomaly while researching the Red Angel's signal over Kaminar. Pike and Tyler investigate the anomaly in a shuttlecraft, sending a probe into it. That same probe soon returns through the anomaly having been upgraded with future technology. It attacks the shuttle, and secretly infects Airiam's augmentations using the shuttle's computer system. Pike and Tyler destroy the probe with Stamets' help, as his exposure to the mycelial network allows him to ignore the time discrepancies in the anomaly. Meanwhile, Burnham visits Vulcan as she continues to search for Spock. Confronting Grayson, Burnham learns that their mother has been hiding Spock, who is in psychological distress and is repeating phrases and a series of numbers. Their father Sarek instructs Burnham to trust Starfleet and take Spock to Section 31 to fix his mind.

Summary from Wikipedia, CC BY-SA 4.0.