Everyone has to start somewhere, including the famed cast of the sci-fi series Star Trek. Before they were crewmembers aboard the USS Enterprise, they were up-and-coming actors looking for their big break.

While many people are talking about the show's legacy over the past half-century, we're taking a look back even further.

Here are the first televised parts for the principal cast of Star Trek, including William Shatner, Leonard Nimoy and Nichelle Nichols. Have you seen any of these performances?