Astro Boy is coming from Imagi Studios' as a CG-animated motion picture produced by Maryann Garger and with David Bowers as director.
Highmore is joining the cast lending his voice to the iconic character and those in charge couldn't be more pleased.
Maryann Garger said: "I am very thrilled that Freddie has accepted this role. He is one of the most talented and acclaimed young actors today, and absolutely ideal to portray the iconic Astro Boy."
Commented David Bowers: "It's terrific that Freddie has agreed to play Astro. He's a remarkably skilled young actor, whose freshness and vitality make him perfect for the role. Astro Boy is a beloved superhero and has captured hearts around the globe for more than 50 years. I can't wait to see where Freddie takes him."