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Anime and Manga
Films - Animation
- Fun and Fancy Free: For Mickey and the Beanstalk, Walt Disney recorded dialogue for Mickey when it was in production prior to the project being put on hold due to World War II. When the film was put back in production after World War II, sound effects wizard Jimmy MacDonald, who had become Mickey's voice by then, finished the mouse's lines.
- Jetsons: The Movie
- After Janet Waldo, the normal voice of Judy Jetson, recorded her dialogue, the Universal execs had pop singer Tiffany, who was originally to just be Judy's singing voice, be her speaking voice as well and rerecord Waldo's lines. Despite that, one of them was kept in, which was most likely an oversight.
- George O'Hanlon and Mel Blanc, the voices of George Jetson and Mr. Spacely respectively, both died during production, so Jeff Bergman filled in for lines they had yet to record.
- The Lion King: Jeremy Irons sung as Scar through most of the "Be Prepared" number, but after he threw out his voice during recording, Jim Cummings sang the rest of the song for him.
- Pooh's Heffalump Halloween Movie: John Fiedler, the voice of Piglet, died during production, so his current voice, Travis Oates, performed the rest of his dialogue.
- The Sword in the Stone: Wart/Arthur had three different voices: one prepubescent, one with an obvious crack in his voice, and one at a post-crack stage. The sudden switches between them can be a bit jarring to say the least.
- Jonny Quest: In the original (1964-1965) series, the voice of Dr. Benton Quest was provided by John Stephenson for the first five episodes and Don Messick for the rest of the season.
- Looney Tunes:
- In Phineas and Ferb, Candace is usually voiced by Ashley Tisdale, but in "Jerk De Soleil", her parsnip allergy-affected voice was done by Dan Povenmire.
- Mike, Lu & Og: Lu, normally voiced by Nancy Cartwright, was voiced by Kath Soucie for a couple of lines in "Roller Madness".
- The Ren & Stimpy Show: The episode "A Visit to Anthony" was in pre-production when John Kricfalusi was fired from the show; while he voices Ren for the majority of the episode, a couple of lines were done by Billy West.
- South Park: Loogie from "The Tooth Fairy's Tats 2000" was voiced by guest Richard Belzer. However, when additional dialogue had to be recorded and Belzer wasn't available, Trey Parker filled in for him.