Bret Iwan was cast as the voice of Mickey Mouse after the death of Wayne Allwine in 2009. Bret first recorded Mickey Mouse dialogue for Disney's Animal Kingdom theme park, as well as the 2009 Disney On Ice show Let's Celebrate!, and Disney Live: Rockin' Road Show. He gave his first full performance as Mickey Mouse for the English version of the PlayStation Portable game "Kingdom Hearts Birth by Sleep". He later reprised the role in "Epic Mickey", "Mickey Mouse Clubhouse and Mickey Mousekersize" and the English version of the Nintendo DS game "Kingdom Hearts Re:Coded". He provided the voice of Mickey Mouse once again in 2011 for "Kinect Disneyland Adventures" and in 2012 for the games "Kingdom Hearts 3D: Dream Drop Distance", "Epic Mickey 2: The Power of Two", and "Epic Mickey: Power of Illusion".

Iwan's first voice over work in a Disney park can be heard in Disney's Animal Kingdom theme park closing show, "Adventurers Celebration" as well as on the newly refurbished "Tomorrowland" Transit Authority attraction in the Magic Kingdom Park, at the Walt Disney World Resort, in which upon passing Mickey's Star Traders, Mickey responds with his signature laugh and 'That's right, it's outta this world!'