|This needs a stretch. (Feel free to remove when satisfied of completion.)|
* History is incomplete.
The Viking ghosts were the disguises of Richard and his actors.
They are viking ghosts who wear yellow shirts. They also wear viking helmets and have white beards.
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Scooby-Doo (DC Comics)
Richard and his actors dressed up as the viking ghosts to scare everyone. To prove they are better than Norman.