The Star Trek franchise employed several of the finest actors on the small screen. It broke new ground in the early days and pushed many of its stars to new levels of success. There's also an impressive amount of appreciation for some of the character actors that fill out the roster. While not everyone can be Shatner or Stewart, some smaller roles attain shocking levels of celebration from hardcore fans and newcomers. Clint Howard portrayed five lesser-known characters across almost 60 years, and he deserves attention.