The Big Bang Theory has entered the multiverse. Stuart Fails to Save the Universe places comic-book store owner Stuart Bloom at the center of a post-apocalyptic, low-budget, CGI-heavy adventure. In the pilot, “Spoiler: Gary Dies,” Pasadena is overrun by giant moths. Instead of fighting Godzilla, Stuart is tasked with reversing an experiment gone wrong after an alternate version of himself visits the store and explains that a quantum device created by Sheldon, Leonard, and Howard fractured rea...