“The Librarians: The Next Chapter,” the spinoff of the acclaimed original television and film franchise following the adventures of the custodians of a magical repository of the world’s most powerful and dangerous supernatural artifacts, kicks off with a two-night premiere event starting on Sunday, May 2, on TNT.br br Vikram Chamberlain (Callum McGowan), a “Librarian” from the past who time-traveled from 1847 and now finds himself stuck in the present. When Vikram returns to his castle in Belgrade, Serbia, and discovers that it is now a museum, he inadvertently releases magic across the continent. With the help of a new team of eclectic heroes, including a savant in world history, a scientific genius, and a highly skilled Guardian, Vikram has only six months to clean up the mess he made.