HBO's "Harry Potter" TV series continues to round out its cast, with the latest additions being Bel Powley and Daniel Rigby.

Class is officially back in session at Hogwarts. HBO's "Harry Potter" television series has started production and added several more actors to its cast, the network revealed on Monday, July 14.

Class is officially back in session at Hogwarts. HBO's "Harry Potter" television series has started production and added several more actors to its cast, the network revealed on Monday, July 14.