So You're Going to the Dentist
Plot: Joe McDoakes' dimwit neighbor Marvin becomes a dentist, and manages to convince poor Joe to let him become Marvin's first patient.
George O'Hanlon. George O'Hanlon was 39 in So You're Going to the Dentist as 'Joe McDoakes'.
Rodney Bell. Rodney Bell was 36 in So You're Going to the Dentist as 'Marvin Schulz (uncredited)'.
Richard L. Bare. Richard L. Bare was 39 in So You're Going to the Dentist as 'Director'