Macaulay Culkin. When was the last time you heard that name? Many were surprised by yesterday’s reporting that the ‘Home Alone’ star has joined the cast of ‘Fallout’ Season 2, claiming he will play a mad genius. Culkin has appeared in only four films in the last twenty years, all of them very low-budget films (“Sex and Breakfast,” “The Wrong Ferrari,” “Adam Green’s Aladdin” and “Changeland”). The appearance in “Fallout” will be his most important role since 1994’s “Richie Rich.”