While most eyes are on the franchise's return to television with the upcoming "Star Trek: Discovery," many fans are undoubtedly looking for news about a sequel to last year's "Star Trek Beyond." But one of the film's stars cautions they may be in for a wait.

While promoting his new film "Aardvark," Zachary Quinto told "Today" that although development has begun on the next "Star Trek" feature, he has no idea about a timeline.

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"We're waiting," said the actor, who's played Spock in three films. "I know they're working on the script for another one, and we'll see how that plays out. But the nice thing about that experience is that the time in between those big tentpole films allows us to go off and cultivate a lot of different creative experiences for ourselves."

"I'm hopeful that we'll do another one," Quinto added, "but there's no guarantee."

That's likely not what "Star Trek" fans want to hear, but it's undoubtedly reality: There is no guarantee of a fourth film in the rebooted series, despite the key players signing on for the Paramount Pictures sequel. J.J. Abrams' 2009 "Star Trek" introduced a new timeline with new actors in the iconic roles to critical and commercial success, leading to two hit sequels, 2013's "Star Trek Into Darkness" and 2016's "Star Trek Beyond."

For a fourth film, the writers will have to contend with the loss of Chekov actor Anton Yelchin, who died in an accident last before before the release of "Beyond." Abrams, who continues as a producer of the series, has said his role won't be recast.