Ron Howard is always cited as one of the most successful child actors of all time, but his brother, Clint, also got started in the business at a very young age as well and made his first acting appearance at the age of four. When he was seven, Clint Howard did a most unusual guest spot on “The Corbomite Maneuver” episode of Star Trek as an alien child named Balok. His voice was dubbed over by an adult, so this is definitely one of the least adorable child acting appearances you will ever see. During the Comedy Central Roast of William Shatner 40 years later, Clint actually made a surprise cameo where he reprised his role as Balok and, man, other than being bigger, he really doesn’t look that much different than he did when he was seven.