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Anime and Manga
- In the English dub of Naruto, the two halves of Zetsu are voiced by different actors. (In the original Japanese he only has one for both.)
- In the English dub of Digimon Savers (Digimon Data Squad), Yggdrasil had three voice actors, Mona Marshall in it's 2-9000WZ form, Johnathan David Cook in it's 7D6 form, and Mari Devon as it's Core form. (The original simply had one voice for all three forms)
Films - Animation
- Atlantis: The Lost Empire: Jim Varney died while recording dialogue for Cookie, so Steven Barr voiced him in the scene near the end where he says goodbye to Milo.
- 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 production resumed after the war, 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 to be just 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, and one at a post-crack stage. The sudden switches between them can be a bit jarring to say the least.
- Looney Tunes:
- In Porky's Hare Hunt, the proto-Bugs rabbit was voiced by Mel Blanc, but the line "Of course you know, this means war!" was read by director Ben Hardaway.
- In Wideo Wabbit, Bugs' voice switches from Blanc to Daws Butler when doing his imitations of Groucho Marx and Art Carney.
- In What's Opera, Doc?, Elmer's yell of "SMOOOG!" was done by Blanc because his normal voice, Arthur Q. Bryan, couldn't say it powerfully enough.
- The 2003 short Hare and Loathing in Las Vegas, Bugs switches between being voided by Joe Alaskey and Billy West.
- 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.