Actress Katherine Parkinson has joined the cast of the new Harry Potter TV series. The IT Crowd star will join the HBO TV show of the popular fantasy novel series to play Molly Weasley, the mother of Ron Weasley.

The “Harry Potter” HBO TV series adaptation is rounding out its cast with seven new additions. The following actors have been added to the show’s cast: Katherine Parkinson as Molly Weasley, Lox Pratt as Draco Malfoy and Johnny Flynn as Lucius Malfoy,

"The Crown" actor Bertie Carvel and "The IT Crowd" alum Katherine Parkinson have joined the cast of HBO's "Harry Potter" series. The network announced casting for Molly Weasley, Draco Malfoy, Cornelius Fudge and more.