Netflix's 'The Haunting of Bly Manor' cast list includes multiple returning actors from 'Hill House'

Pedretti played Luke's twin sister Nell in "Hill House." For "Bly Manor," she'll play a character named Dani, who she described in a Twitter video as a "governess who takes care of two very unusual children."

Flanagan announced on Twitter on Wednesday that Henry Thomas will join "Bly Manor." Thomas played the young Hugh Crain in "Hill House," the father of the Crain children. It has not been announced who he is playing in "Bly Manor."

Flanagan announced on Thursday that Siegel (who he's married to) will also join the cast of "Bly Manor" in an undisclosed role. She played Theodora Crain in "The Haunting of Hill House."

• Read more of Business Insider's coverage of Netflix's "The Haunting of Hill House":
• Netflix's 'The Haunting of Hill House' actor pointed out a disturbing clue about the fate of the show's characters
• Netflix's 'The Haunting of Hill House' director explains how he kept the show's biggest mystery hidden
• 'The Haunting of Hill House' director changed the show's original ending because it would have been too cruel
• The cast of 'The Haunting of Hill House' couldn't sleep and felt 'crazed' during filming
• How 'The Haunting of Hill House' pulled off its best episode, which included '18-page scenes without any cuts'
• Stephen King loves 'The Haunting of Hill House' and called it 'close to a work of genius'