The film centres on Amadeo, a shy but talented young man and his table football team, who magically come to life as they try to reunite after being dismantled and torn from their home.
Rupert Grint, Anthony Head, Ralf Little, Rob Brydon and Alistair McGowan feature in the voice cast of the movie, which is directed by Oscar-winning Secret in their Eyes filmmaker Juan José Campanella.
Campanella said of the English-language cast of The Unbeatables: "I loved Rupert's work in Harry Potter and I knew he would bring an honesty and intelligence to the part of Amadeo. As it is he played the part perfectly, he has the right nuances, he is the right age and he has the right level of tenderness.
"It is pretty amazing what he did - he is really very, very good. I love him! As to Rob Brydon, he and Steve Coogan were so brilliant in The Trip I just wanted him in the film. Both Rupert and Rob are superb."
The Unbeatables will open in UK cinemas on August 15.