The crew of the USS Enterprise indulges in a little song and dance on a mission that seems like a humorous and light-hearted musical at first, but quickly grows into a high-stakes mission over the fate of Starfleet. And the musical interlude comes at a personal crossroads for Spock and Christine Chapel, along with Christopher Pike and Batel. By the time the final song has been sung, several members of the crew walk away with a better understanding of themselves -- albeit not all in the happiest of ways.
Source：https://www.cbr.com/star-trek-strange-new-worlds-season2-episode9-recap-spoilers/
