According to an old listing on future bloopers, this episode was originally going to star SMG4, Starman3, and OnyxKing67 and Mr. C was the person who was telling the story. SMG3, SM3, and OK67 were replaced with Wario and Waluigi and OnyxKing67 replaced Mr. C as the person who told the story.[1]
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Halloween 2014 Mario's Tunnel of Doom (Very Scary)