Question: How many injections does Jekyll need to take to prevent himself from turning into Hyde? The first time Jekyll speaks with Nick, he feels himself about to transform but takes a serum to prevent it but, later, when Jekyll's talking to Nick again, he feels himself about to change again and tries to take another injection.

The Mummy (2017)
4 questions
Directed by: Alex Kurtzman
Starring: Tom Cruise, Russell Crowe, Annabelle Wallis, Sofia Boutella
Factual error: It is roughly 120-135 dB inside of a C-130, especially one that hasn't been specifically modified. It is so loud that it is painful to be in the cargo hold without hearing protection (besides it being outside of military regulations) and you certainly couldn't have a normal conversation while it was in flight.
Chris Vail: What do we do now?
Nick Morton: Where's your sense of adventure?
Trivia: At one point, Jenny grabs a large book and hits a man over the head with it during a scuffle. She actually hits him with a book that is modeled to look similar to the "Book of the Dead" from the 1999 "Mummy" film, and even includes the star-shaped key-hole cover. A cute "blink-and-you'll-miss-it" inside-joke thrown in as a nod to the previous "Mummy" franchise.
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Answer: As many as needed, Mr. Hyde was asserting himself, trying to take over. Like "Blade," he needed to take more and more injections of the serum, because the vampire blood was getting stronger and stronger.