An Oscar Winner Appeared in The Show
There are many cases of big-name actors appearing in minor roles when they were first breaking into the industry, and we can see one incredible example of that in Little House on the Prairie. Iconic actor Sean Penn actually appeared in the show. He played a schoolboy in just one episode.
Source: IMDb / Photo by Gareth Cattermole, Getty Images
At the time, everyone must have just seen him as another kid on the set. Little did they know that he would grow up to become a real Hollywood legend, winning two separate Academy Awards for his starring roles in Milk and Mystic Rover, as well as many other Oscar nominations.