The first contact made by the USS Discovery in 3190 with Species 10-C, the immense beings from beyond the galaxy whose mining device, the Dark Matter Anomaly, was threatening Earth and Ni'Var.
First contact with Species 10-C is the climax of the fourth season of Discovery, told in Rosetta, Species Ten-C and Coming Home. Discovery crosses the galactic barrier with a delegation that includes President Rillak, T'Rina of Ni'Var and General Ndoye of Earth. On the dead world the species once lived on, a landing party finds dust that carries emotions and concludes that the 10-C communicate partly through chemistry.
At the hyperfield where the 10-C now live, the crew build a shared language from those compounds, patterns of light and mathematics. The talks are endangered when Ruon Tarka, aided by Ndoye, tries to take the field's power source.
Booker's ship is destroyed and Tarka dies. Michael Burnham explains to the 10-C what their machine has done to individual lives, something they had not understood. They withdraw the anomaly, repair the damage and return Booker.