By Aishwarya Venugopal

(Reuters) - Walt Disney Co on Thursday agreed to buy film, TV and international assets from Rupert Murdochs Twenty-First Century Fox Inc for $52.4 billion as Disney seeks greater scale to tackle growing competition from Netflix and Amazon .com.

Under the terms of the all-stock deal, Disney acquires significant assets from Fox, including the studios that produce the blockbuster Marvel superhero pictures and the Avatar franchise, as well as hit TV shows such as The Simpsons.

Fox shareholders will receive 0.2745 Disney shares for each share held. This translates to a value of $29.50 per share for the assets that Disney is buying, Reuters calculations based on Disneys Wednesday market closing price show.

Immediately prior to the acquisition, Fox will separate the Fox Broadcasting network and stations, Fox News Channel, Fox Business Network, FS1, FS2 and Big Ten Network into a newly listed company that will be spun off to its shareholders.

The deal ends more than half a century of expansion by Murdoch, 86, who turned a single Australian newspaper he inherited from his father at the age of 21 into one of the worlds most important global news and film conglomerates.

Disney Chief Executive Bob Iger, 66, will extend his tenure through the end of 2021 to oversee the integration of the Fox businesses. He has already postponed his retirement from Disney three times, saying in March he was committed to leaving the company in July 2019.

Disney will also assume about $13.7 billion of Foxs net debt in the deal.

Through Foxs stake in the Hulu video streaming service, Disney will assume majority control of one of Netflix Incs main competitors. Hulu is also partially owned by Comcast Corp and Time Warner Inc.

Shares in both Disney and Fox were up nearly 1 percent in premarket trading.

(Reporting by Aishwarya Venugopal in Bengaluru; editing by Patrick Graham)