|This needs a stretch. (Feel free to remove when satisfied of completion.)|
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- Big Ralph's wife (only time mentioned)
|Mystery Inc.||They were desperate to get Shaggy and Scooby-Doo to take a bath.|
|Big Ralph||He knew all about Machina.|
|Velma Dinkley as Machina||To get Shaggy and Scooby to take a bath. The whole mystery was staged for that purpose.|
|Big Ralph||Gave the gang a surprise vengence wash to pay them back for ruining his wife's fudge and making him "madder than a really wet hen".|
- Scooby-Doo, Where Are You? #10 (June 2011).