Slytherin has been the house of dark wizards, but their history is more interesting and complex than people think.

Not all ghosts in cinema are villainous. Some are portrayed as romantic leads or helpful heroes. Examples include Shoeless Joe Jackson in Field of Dreams and Moaning Myrtle in Harry Potter.

Fisher-Becker appeared in the first “Harry Potter” movie as as the Hufflepuff ghost Fat Friar. In three episodes of “Doctor Who,” he played Dorium Maldovar, a black marketeer who owed the ...