Cassidy's credits include Universal Pictures' Snow White and the Huntsman, opposite Charlize Theron, Kristen Stewart, and Chris Hemsworth, and Tim Burton's Dark Shadows, with Johnny Depp for Warner Bros. In 2015, Cassidy completed production as Molly in Amber Entertainment's Molly Moon and the Incredible Book of Hypnotism, with Emily Watson and Dominic Monaghan, and starred as the android Athena in Disney's Tomorrowland, with George Clooney, Hugh Laurie, and Britt Robertson. On the television front, Cassidy co-starred in Mr. Selfridge, alongside Jeremy Piven.
In 2013 Cassidy was named on Screen International magazine's Stars of Tomorrow. She is the youngest actor to be featured on the annual list.
Cassidy is also featured in some short films, such as The Beast, Rust, and Miranda's Letter.
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