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At a special presentation, a panel featuring the "Voices of the Parks" read familiar scripts from Disney theme park attractions that they have lent their talents to over the years including the Tower of Terror, Autopia, It's a Small World, Mark Twain Riverboat, Indiana Jones Adventure, and more. Some are imitations, like Rod Serling and Darth Vader, and others are original characters.
Panelists:
Chris Edgerly - Dumbo
Bob Joles - Indiana Jones (John Rhys Davies does the main show, Bob the pre-show)
Audrey Wasilewski - Autopia
Dee Bradley Baker - California Screamin'
Corey Burton - Parking Lot Trams
BJ Ward - Peoplemover
Fred Tatasciore - Orbitron from Hong Kong DL (as Darth Vader)
Mark Silverman - Tower of Terror
Stephen Stanton - Mark Twain
Jeff Fischer - Great Piggy Bank Adventure (Innoventions)
Bill Rogers - Lights Out Announcement (Voice of Disneyland)
(Thanks to whitefiretheater for posting this list in the comments below!)