Star Trek: The Next Generation

Season 2 We cannot prevent millions of people from dying on this planet, it would be a violation of the prime directive, which is the very BACKBONE of Starfleet

Season 6 *gives Mark Twain a tour of the ship*

Source: trekghost-blog
TNGit's fine he wrote A Connecticut Yankee in King Arthur's Courthe can handle deanna's space ballerina outfits