"Birthright" is a story spanning the 16th and 17th episodes of the sixth season of the American science fiction television series Star Trek: The Next Generation, the 142nd and 143rd episodes overall. Set in the 24th century, the series follows the adventures of the Starfleet crew of the Federation starship Enterprise-D. In this episode, Worf and Data both seek to know more about their fathers: Worf through visiting a world inside Romulan territory and Data through a newly discovered dream program.