Ghostbusters: Frozen Empire brings back fan-favorite characters with a new twist, like Janine suiting up as a Ghostbuster for the first time. The sequel introduces a new villain with a terrifying power: the ability to kill with fear alone. The return of the library ghost hints at a darker spin on the power to embody the greatest fear, potentially making Ghostbusters: Frozen Empire scarier than its predecessor.

A lot of fan-favorite characters will return in Ghostbusters: Frozen Empire, but the sequel’s trailer makes it clear that one comeback will be more than mere fan service. Ghostbusters: Afterlife had to tread a tricky line when it came to the sci-fi comedy reboot’s returning characters. On the one hand, 2016’s earlier Ghostbusters was criticized for not bringing back enough heroes and villains from the original movies. On the other hand, focusing on existing characters over new cast members could have...