A new series, "Sonic X," began airing in 2003. The 78-episode anime series detailed Sonic's struggle to protect the Chaos Emeralds from Eggman and new villains. Featuring a cross-world and interstellar journey, "Sonic X" depicted Sonic and his human friend Chris Thorndyke in quests to save the world. "Sonic: Night of the Werehog" is a short film produced by Sega's VE Animation Studio, released to coincide with the release of "Sonic Unleashed". In the film, Sonic and Chip enter a haunted house, and must deal with two ghosts trying to scare them in attempt to win the heart of the girl ghost. Sonic also makes multiple cameo appearances in the Disney films, "Wreck-It Ralph" and its sequel "Ralph Breaks the Internet".