Jason O’Mara, Terra Nova Jason O’Mara, Terra Nova

Fox has pushed the premiere of its new Steven Spielberg-produced series, Terra Nova, to fall.

The network announced Friday that it was scrapping plans to air the first episode on May 23, originally intended to be a preview of the drama set in pre-historic times. Fox President of Entertainment Kevin Reilly said the network needs more time to work on the visual effects.

A Land Before Time: Can Terra Nova's travelers survive dinosaurs, change the future?

"Terra Nova is one of the most ambitious television series ever produced," he said in a. "The cutting-edge visual effects used to create the world of Terra Nova, which is of massive scope and scale, require more time to be realized. This aspect of the series is essential, so we are pushing back the special early preview date to give the visual effects team the time needed for their ground-breaking work."

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Terra Nova stars Jason O'Mara as the patriarch of a family who escape the overpopulation of Earth and travel through a crack in the space-time continuum, which leads to a pre-historic Earth. Stephen Lang and Shelley Conn also star.