High Quality Content by WIKIPEDIA articles! The following is an episode list for the Nickelodeon animated television series Dora the Explorer. The show debuted on August 14, 2000 and airs on Nickelodeon`s sister Noggin (now Nick Jr.), and Nickelodeon`s preschool block, Nick Jr. (now Nick Play Date), and has also aired on Comcast`s On Demand and CBS. As of April 2, 2012, it is Nick Jr.`s longest running program.