By James Hibberd
Updated August 05, 2011 at 11:14 PM EDT
Credit: Fox
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So wait: If Terra Nova has people from the future going back in time to give humanity a second chance, how will they avoid mucking up the future through everything they do?

Producers have added an element into the show’s heavily reworked pilot to help answer all those pesky issues, which TV critics at Fox’s press tour grilled producers about during the network’s last press tour (back when we all thought Terra Nova was going to debut in May).

“So many people had the idea they were going back to change history, we wanted to change that,” said executive producer Rene Echevarria.

In the show, we learn they’re not going back into our past, but are on Earth during a “different time stream” — so nothing they do impacts the future. “They’re colonists,” said Echevarria.

“We’ve always planned to address those issues,” added said exec prod Brannon Braga. “You’ve got to make sure you don’t have any holes due to the butterfly effect.”

Which doesn’t mean that living alongside dinosaurs won’t present a potential problem in a million years or so. “There’s an asteroid coming — in a while,” Braga said. “But one of the cool things about the show is they have futuristic technology that we don’t have today. So they’re a little more prepared to deal with that.”

What about cave men?

“Early Man have not appeared yet,” Braga said, noting it takes place 85 million years ago.

And what about Sleestacks?

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Terra Nova

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