William Hanna Director Charlie Adler Rocky Voice Michael Bell Mr. Pyrite Voice Charlie Brill Additional Voices Voice Ruth Buzzi Additional Voices Voice Henry Corden Fred Flintstone Voice Mark Hamill Slick Voice Mary Hart Mary Hartstone Voice Jerry Houser Bamm-Bamm Rubble Voice Gordon Hunt Additional Voices Voice Brad Garrett Big Rock Voice Allan Lurie Additional Voices Voice Tress MacNeille Additional Voices Voice Don Messick Baby Bamm-Bamm , Lot Security Guard , Tour Bus Driver Voice Brian Stokes Mitchell Additional Voices Voice Howard Morris Bird Voice Iwao Takamoto Producer