When does Danny Phantom return?

Danny Phantom is an American animated superhero action adventure television series. The series premiered on April 3, 2004, right after the 2004 Kids' Choice Awards, and ended on August 24, 2007. It follows Danny Fenton, a teenage boy who, after an accident with an unpredictable portal between the human world and the "Ghost Zone", becomes a human-ghost hybrid and takes on the task of saving his town (and the world) from subsequent ghost attacks.
Daniel "Danny" Fenton, a 14-year-old boy living in the small town of Amity Park, lives with his ghost hunting parents, Jack and Madeline "Maddie" and his overprotective sister, Jasmine "Jazz" The Fentons' Ghost Portal created by his parents in their attempt to bridge the human world and the Ghost Zone (the parallel universe in which ghosts reside), failed to work. Once inside, he inadvertently presses the "On" button (which his parents naively failed to do), thus activating the Portal and infusing his DNA with ectoplasm, transforming him into a half-ghost. Danny develops much stronger abilities, such as his Ghost Ray (a concentrated blast of energy he fires from his hand)