Ruby (represented by David Daly Associates), who was cast after a world-wide casting search, stars as young orphan Sophie, opposite Mark Rylance in the title role.
She can also be seen as Isobel in the fourth series of CBBC's 4 O'Clock Club.
Directed by Steven Spielberg, The BFG tells the imaginative story of a young girl and the Giant who introduces her to the wonders and perils of Giant Country.
Upon her arrival in Giant Country, Sophie, a precocious 10-year-old girl from London, is initially frightened of the mysterious giant who has brought her to his cave, but soon comes to realize that the BFG (played by Mark Rylance) is actually quite gentle and charming, and nothing like the other inhabitants of Giant Country.
Standing 24-feet tall with enormous ears and a keen sense of smell, the Big Friendly Giant is endearingly dim-witted and keeps to himself for the most part. Giants like Bloodbottler (Bill Hader) and Fleshlumpeater (Jemaine Clement) on the other hand, are twice as big and at least twice as scary and have been known to eat humans, while the BFG prefers Snozzcumbers and Frobscottle.
The BFG brings Sophie to Dream Country where he collects dreams and sends them to children, teaching her all about the magic and mystery of dreams.
Having both been on their own in the world up until now, their affection for one another quickly grows. But Sophie’s presence in Giant Country has attracted the unwanted attention of the other giants, who have become increasingly more bothersome. Sophie and the BFG soon depart for London to see the Queen (Penelope Wilton) and warn her of the precarious giant situation, but they must first convince the Queen and her maid, Mary (Rebecca Hall), that giants do indeed exist. Together, they come up with a plan to get rid of the giants once and for all.
Spielberg is bringing the film to the big screen with a screenplay by Melissa Mathison (E.T.: The Extra-Terrestrial), based on the best-selling novel by Roald Dahl.
The BFG is due to open in cinemas on July 22nd 2016, the year that marks the 100th anniversary of Dahl’s birth.
Check out the teaser trailer below!