The Original Darrin

The Original Darrin is where the original actor replaces the new actor in a single continuity. It usually happens in films, animation and video games. A notable example is where Robin Williams returned to voice the Genie in Aladdin and the King of Thieves after Dan Castellaneta replaced him for The Return of Jafar. Subtrope of The Other Darrin and Role Reprisal.

Film

 * Aladdin and the King of Thieves had Robin Williams returning as the Genie after Dan Castellaneta replaced him in The Return of Jafar.

Professional Wrestling

 * Kevin Nash and Scott Hall played Diesel and Razor Ramon in royal rumbles, years after losing rights to play those roles to WWE when they left the company in 1996 and being replaced by Glenn Jacobs as Diesel and Rick Bognar as Razor Ramon, respectively. In-universe Diesel and Nash were acknowledged as the same person anyway.
 * Also in WWE, Luis Ignacio Urive Alvirde returned as Sin Cara after being injured, and his replacement was retconned into being a pretender.

Video Games

 * Prince of Persia: The Two Thrones had Yuri Lowenthal returning to voice the Prince after he was replaced by Robin Atkin Downes in Warrior Within.
 * Spider-Man 2 had Kirsten Dunst returning to voice Mary Jane after Catherine O'Conner voiced her in the 2002 game.
 * Spider-Man 3 had J.K. Simmons and James Franco returning to their roles from the films after being voiced by Jay Gordon and Josh Keaton respectively in the previous games.
 * For the video games based on the first two Michael Bay Transformers films, Frank Welker returned to voice Megatron after Hugo Weaving replaced him.

Western Animation

 * The Emperor's New School had John Goodman returning to voice Pacha in the second season after Fred Tatasciore replaced him.
 * The VeggieTales Show had Phil Vischer returning to voice Mr. Nezzer whenever David Mann is unavailable.