The upcoming Harry Potter TV series is gaining momentum with casting announcements, including Katherine Parkinson as Molly Weasley. Parkinson, known for ‘The IT Crowd,’ joins a cast featuring Dominic McLaughlin as Harry, Arabella Stanton as Hermione, and Alastair Stout as Ron. Other notable actors include John Lithgow as Dumbledore and Janet McTeer as McGonagall.