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The Waluigi Arc EXPLAINED is a video created by SMG4 and released on September 26, 2018. The video is a "Behind-The-Scenes", where Luke and Kevin explain how they came up with and developed the episodes of The Waluigi Arc.
We go behind the scenes with SMG4 and Kevin to talk about the Waluigi arc, how it ALMOST didn't happen and what's in store next!
Luke and Kevin said that Desti was originally going to play a role in one of the arc episodes, but they ultimately went in another direction and that video became Waluigi's Time.
They also confirmed that the original ending to SMG4: Mario And The T-Pose Virus wouldn't have included Waluigi as the cause of the virus, but they decided that there would be no point to the ending and included him.