What actor has starred in both Harry Potter and Regression?
Regression (film): Regression is a 2015 Canadian-Spanish-American psychological thriller mystery film directed, produced and written by Alejandro Amenábar. Regression (film):  The film stars Ethan Hawke and Emma Watson, with David Thewlis, Lothaire Bluteau, Dale Dickey, David Dencik, Peter MacNeill, Devon Bostick and Aaron Ashmore in supporting roles. David Thewlis:  His most commercially successful role to date has been that of Remus Lupin in the "Harry Potter" film series.
i don't know