The future of The Mummy director Alex Kurtzman's involvement with Universal's shared monsters Dark Universe franchise is in doubt.

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When IGN asked Kurtzman during the Television Critics Association press tour (where Kurtzman is promoting Star Trek: Discovery) if he is still involved in the Dark Universe in the wake of The Mummy, Kurtzman said he wasn't sure."You know the truth is, I don't know. I really don't know," Kurtzman told IGN. "I haven't really decided. Is the honest answer."Kurtzman directed this year's action horror flick The Mummy, which opened to poor domestic box office and critical response. He is still currently slated to produce 2019's The Bride of Frankenstein, as well as subsequent entries featuring the Creature from the Black Lagoon, the Invisible Man, Van Helsing, and more.The answer came in the wake of another question about knowing when to call it quits on a franchise."I have to stay interested in it," said Kurtzman. "I have to feel like my passion is there for it. I think in the case of Star Trek if your passion isn't there you shouldn't be doing it. "In a separate interview, Kurtzman addressed The Mummy's box office success in China, and whether or not subsequent Dark Universe films might be more tailored to a foreign audience."It's hard for me to know, is the truth," said Kurtzman. "I think every movie will be different. I certainly know that the legacy of the monsters have endured across the world throughout the years. Almost a century. So I have to believe American audiences will find it too with the right ingredients."Universal Pictures' classic monsters shared universe was officially named the Dark Universe franchise back in May , and kicked off with The Mummy in June. The Dark Universe is set to include Johnny Depp as The Invisible Man, Javier Bardem as Frankenstein’s Monster, and Russell Crowe as Dr. Jekyll. Bride of Frankenstein will be directed by Beauty and the Beast's Bill Condon , and is set for a February 14, 2019 release.

Lucy O'Brien contributed to this report.