He along with his brother both first appear as XSSD foes and challenges Talim, Jigglypuff, Gambit and Baby Mario to a death race in which they both lose and both are put to death. However both return as Bastion managed to make Sentinel's out of them. Waluigi alternate ego is Todo who turns up and tries to stop the Bastion taking over and he reveals he is the father of Yun. Waluigi returned intially as Todo in Age of Apocalypse being a captive but this was before his dark side of Waluigi returned and started to cause havoc again.
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