The Vulcan Hello podcast returns with a dissection of the first of four “short films”—didn’t we used to call these Webisodes?—running up to second season of “Star Trek: Discovery.” In “Runaway,” Tilly—we love Tilly!—discovers a mysterious and dangerous stowaway alien monster that might actually just be a grumpy teenager. Also we share our reactions to the new season 2 “Discovery” trailer, featuring hunky Spock! Deal with it, people....