''Roswell'' is an American science fiction television series that presents a timeline where the Roswell UFO exists, and aliens are hiding in plain sight as a trio of high school-aged teenagers. Developed, produced, and co-written by Jason Katims, the series debuted on October 6, 1999, on the WB, and later shifted to UPN for the third season. The final episode aired on May 14, 2002. Sixty-one episodes in total were broadcast over the show's three seasons. In the United Kingdom, the show aired as both ''Roswell High'' and ''Roswell''.