Richard Linklater's lighthearted rendering of an imagined relationship between Orson Welles and a young would-be actor during Welles' famed 1937 New York production of 'Julius Caesar' soars whenever Christian McKay takes the screen (as the great maestro). But the film backslides whenever McKay is absent, largely due to a severe case of miscasting (Zac Efron and Claire Daines). Grade: C.   

You might wonder why it was necessary to add '17 Again' to Hollywood's long list of "body swap" comedies over the last 25 years, but I have a theory about such genre fare. At some point in the rise of every young would-be star, the movie industry needs to figure out if they've really got what it takes. Grade: C.