Directed by Omar Madha and written by Bo Yeon Kim, Erika Lippoldt, and Alan B McElroy, "Terra Firma, Part I" explains why the franchise doesn't have more interdimensional travel in a sense There are some spoilers of the episode.
"Terra Firma, Part 1" — Ep#309 — Pictured (L-R): Michelle Yeoh as Georgiou and Sonequa Martin-Green as[...]