“The Reality War,” the finale of the 15th season of Doctor Who, saw Ncuti Gatwa exit the role of the Doctor, regenerating into Billie Piper, who previously appeared in the series as the Doctor’s ...

For many, it can be incredibly intimidating to get into a series after its beginning. For geeks, it can be doubly so. Some comics number in series well into the 700s; popular science fiction TV shows ...