Episode eight of Star Trek: Discovery's second season, “If Memory Serves,” streams tonight. Need to brush up on what happened last week before the story continues? StarTrek.com is here to prep you for it with six highlights from "Light and Shadows” and a preview of “If Memory Serves.”

Angel Among Us

In a personal log, Burham explains, “The Angel is humanoid and wearing an exosuit made of future technology we’ve never seen. But whose future… and why? The only person who may be able to answer these questions is the one person nobody can find.” That person, of course, is Spock.

What the Frick?

Time is of the essence as the crew discusses, reacts to a variety of temporal fluctuations. Each occur aboard the U.S.S. Discovery and then on the shuttle flown by Captain Pike and Ash Tyler, which is attacked by a familiar but futurized probe. Tilly collaborates with Stamets, racing against the clock to help save the day, and banking on Stamets’ tardigrade DNA to pull of their plan. There’s a nice Tilly-Stamets moment in which he implores her to, “Trust the math. More importantly, trust yourself.” Pike (who doesn’t trust the Klingon shadow with Tyler) and Tyler (who doubts Pike’s bread crumb notion of releasing plasma from the shuttle’s nacelles) reach a semblance of coexistence and grudging respect by the end.

Light and Shadows
(L-R): Mary Wiseman as Tilly; Anthony Rapp as Stamets

Spock Down the Rabbit Hole

Burnham appeals to Amanda for help in finding Spock, quickly realizing that her mother has been lying to her. He’s on Vulcan, hidden in a sacred crypt, and he’s in rough shape: rambling, deeply troubled, unreachable. His sister finds Spock carving not just a Red Angel into a wall, but also random numbers – 841947 – that turn out to be not so random. Deeply displeased by recent events is Sarek. Burnham looks on as her mother and father spar. Amanda lands the best, most-cutting verbal blow: “Try again, husband.”

31 and Counting

Spock enters the care of Section 31, with Leland promising that he will restore Spock to his normal self. However, Georgiou warns Burnham that Leland is a “puppet” and the device he intends to use on Spock is actually a memory extractor. Georgiou suggests that Burnham attack her and rescue Spock – a scenario that’ll be good for Spock, good for Burnham and bad for Leland, which will in turn be good for Georgiou. Somewhere in the midst of the Burnham-Georgiou intrigue, the Emperor utters these ominous words: “I know so much more about you than you can imagine. But that’s for another time.” Later, there’s a tense conversation between Georgiou and Leland. “You need me to keep Burnham from finding out the truth,” she hisses after he warns her not to overstep. Leland plays coy. “The truth?” Georgiou sneers and says, “You’re responsible for the death of her parents. Mind your manners. You’re no longer calling the shots.”

Light and Shadows" -- Episode #207 -- Pictured (l-r): Sonequa Martin-Green as Burnham; Michelle Yeoh as Georgiou of the CBS All Access series STAR TREK: DISCOVERY
(L-R): Sonequa Martin-Green as Burnham; Michelle Yeoh as Georgiou
Michael Gibson/CBS ©2018 CBS Interactive, Inc.

Airiam Sees Red

Pike and Tyler are back on the Discovery bridge, safe and sound, and having reached a place of grudging respect for each other. And they agree on a key fact. “Whether the Red Angel is here to end something or start something, one thing is for sure,” Tyler notes. “We’re in the middle of a fight for the future.” Meanwhile, did anyone notice that when the probe extracted data from the shuttle and Discovery something funky happened to Airiam? A glitch? Possession? Sensory overload? Maybe even assimilation? Stay tuned.

And on to Talos IV

Those numbers that Spock scribbled on the wall? Turned backwards, they were… coordinates. 7-4-9 Mark 1-4-8. Talos IV. Burnham can’t help but ask aloud, “Where are you taking us, Spock?” The answer is to next week’s episode.

Global Preview: “If Memory Serves”

In episode eight, Spock and Burnham head to Talos IV, where the process of healing Spock forces the siblings to confront their troubled past. Stamets desperately tries to reconnect with an increasingly disconnected Hugh, while Tyler struggles to shed the crew’s suspicions of him due to his past as Voq.

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Global Preview: "If Memory Serves"

Star Trek: Discovery streams exclusively on CBS All Access in the United States and is distributed concurrently by CBS Studios International on Netflix in 188 countries and in Canada on Bell Media’s Space Channel and OTT service Crave.

Star Trek: Discovery
Michael Burnham
Captain Pike