The 13-part series, which counts Family Guy creator Seth MacFarlane as an exec producer, will premiere on all 90 National Geographic Channels in 180 territories and on 120 Fox International Channels-branded networks in 125 territories globally.
Immediately after the US launch on March 9pm ET on Fox and 24 hours later on cable channel Nat Geo, international networks will begin running the premiere episode and conclude within a week of the original broadcast.
This differs in the UK, where Cosmos will air on March 16.
FIC has had massive success going day-and-date with zombie drama The Walking Dead and Nat Geo with factual entertainment series but this marks the first time the two 21st Century Fox-owned brands have worked together in this way.
“The vision of Cosmos: A Spacetime Odyssey inspired us to create a launch across all of our National Geographic Channels and FOX channels that will reach an unprecedented 400 million homes outside the US,” said Liz Dolan, chief marketing officer of FIC and National Geographic Channels International.
“We have done global launches across all of our Fox entertainment channels for shows like The Walking Dead. We have done global launches across all of our National Geographic Channels for shows like Brain Games. But we have never put the combined FIC power of our entertainment channels and our Nat Geo channels behind one show and premiered it day and date with the United States.”