Citing the need for more special effects production time, Fox has canceled the May two hour preview that had been scheduled for executive producer Steven Spielberg’s big budget television series ‘Terra Nova’.

Originally set for a 2011 midseason premiere, the series was pushed back for a two hour preview set for May 24 and 25. Again the series has now been pushed back to an unknown fall date.

In a prepared statement Fox executive Kevin Reilly said, “Terra Nova is one of the most ambitious television series ever produced. 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 preview date to give the visual effects team the time needed for their ground-breaking work.”

“The world of Terra Nova is visually stunning on multiple levels, and effects play an enormous part,” said executive producer René Echevarria. “Premiering in the fall will give us the proper time to create a world never before seen on television.”

Doesn’t anyone remember ‘Jurassic Park’, ‘Dinotopia’ ‘Sliders’ and even ‘Primeval’?

‘Terra Nova’ follows an ordinary family embarking on an incredible journey back in time to prehistoric Earth as a small part of a daring experiment to save the human race.

Given there are 12 executive producers (for a television series?) and Spielberg’s background in working with complicated visual effects and especially dinosaurs, and now the multilple push backs, this sounds like a big budget television series that will probably end up being a four hour “special event”. And then sadly never-to-be heard of again.