Burnham goes back to Vulcan whilst Discovery encounters a temporal anomaly.
This is a pretty good episode, especially the visuals, with a strong plot that is unfortunately let down by the exposition.
I enjoyed the story, which I found to be quite compelling and the final reveal works not only as great fan service but as hook to find out what happens next. I hope the writers have something in mind for preserving the legacy of the Trek canon as they write this story, but if it turns out to be something special I will forgive the franchise inconsistency. The sub-plot involves great sci-fi, but probably could have done without the similarity in tech design to The Matrix.
Generally in the episode the visuals are brilliant. The cinematography is excellent and works well for the visual storytelling. Some of the editing is also superb. One of my favourite parts is a transition between one Discovery character's eye to a light aboard another ship.
Where I struggle, as usual with Discovery, is the dialogue. I find the exposition to be so deliberate and obvious that it feels unnatural. Pretty much all of the intro sequence is a big information dump and the episode is littered with other similar moments. I don't mind it so much during the technobabble sequences, because these things need explanations but they do drag on a bit in this show. The worst line in the episode for me was one character reveal about Burnham that was unimaginatively spoken between two Section 31 characters.
Performances from all cast are solid with nobody especially standing out except Sonequa Martin-Green who leads her scenes well and possibly Mary Wiseman who continues to entertain.
For me this is a 7.5/10 but I round upwards.